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Finding the Fourth Proportional to 1,147.71, 1,721.57 and 378.21

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Solution

The fourth proportional to 1,147.71, 1,721.57 and 378.21 is: 567.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.71 : 1,721.57 = 378.21 : x
  2. Step 2: Convert to fraction form
    1,147.71/1,721.57 = 378.21/x
  3. Step 3: Cross multiply
    1,147.71x = 1,721.57 × 378.21
  4. Step 4: Simplify right side
    1,147.71x = 651,113.10
  5. Step 5: Solve for x
    x = 651,113.10/1,147.71
  6. Step 6: Final answer
    x = 567.32

Related Problems

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Double scale
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Similar ratio
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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.