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Finding the Fourth Proportional to 921.69, 1,271.57 and 607.12

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Solution

The fourth proportional to 921.69, 1,271.57 and 607.12 is: 837.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.69 : 1,271.57 = 607.12 : x
  2. Step 2: Convert to fraction form
    921.69/1,271.57 = 607.12/x
  3. Step 3: Cross multiply
    921.69x = 1,271.57 × 607.12
  4. Step 4: Simplify right side
    921.69x = 771,998.06
  5. Step 5: Solve for x
    x = 771,998.06/921.69
  6. Step 6: Final answer
    x = 837.59

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.