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Finding the Fourth Proportional to 661,638.30, 992,457.45 and 381,702.30

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Solution

The fourth proportional to 661,638.30, 992,457.45 and 381,702.30 is: 572,553.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,638.30 : 992,457.45 = 381,702.30 : x
  2. Step 2: Convert to fraction form
    661,638.30/992,457.45 = 381,702.30/x
  3. Step 3: Cross multiply
    661,638.30x = 992,457.45 × 381,702.30
  4. Step 4: Simplify right side
    661,638.30x = 378,823,291,317.14
  5. Step 5: Solve for x
    x = 378,823,291,317.14/661,638.30
  6. Step 6: Final answer
    x = 572,553.45

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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.