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Finding the Fourth Proportional to 642,703.32, 886,983.66 and 356,313.24

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Solution

The fourth proportional to 642,703.32, 886,983.66 and 356,313.24 is: 491,741.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,703.32 : 886,983.66 = 356,313.24 : x
  2. Step 2: Convert to fraction form
    642,703.32/886,983.66 = 356,313.24/x
  3. Step 3: Cross multiply
    642,703.32x = 886,983.66 × 356,313.24
  4. Step 4: Simplify right side
    642,703.32x = 316,044,021,721.66
  5. Step 5: Solve for x
    x = 316,044,021,721.66/642,703.32
  6. Step 6: Final answer
    x = 491,741.70

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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.