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Finding the Fourth Proportional to 1,147.42, 1,721.13 and 637.66

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Solution

The fourth proportional to 1,147.42, 1,721.13 and 637.66 is: 956.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.42 : 1,721.13 = 637.66 : x
  2. Step 2: Convert to fraction form
    1,147.42/1,721.13 = 637.66/x
  3. Step 3: Cross multiply
    1,147.42x = 1,721.13 × 637.66
  4. Step 4: Simplify right side
    1,147.42x = 1,097,495.76
  5. Step 5: Solve for x
    x = 1,097,495.76/1,147.42
  6. Step 6: Final answer
    x = 956.49

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.