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Finding the Fourth Proportional to 642,255.45, 886,720.91 and 400,892.66

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Solution

The fourth proportional to 642,255.45, 886,720.91 and 400,892.66 is: 553,486.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,255.45 : 886,720.91 = 400,892.66 : x
  2. Step 2: Convert to fraction form
    642,255.45/886,720.91 = 400,892.66/x
  3. Step 3: Cross multiply
    642,255.45x = 886,720.91 × 400,892.66
  4. Step 4: Simplify right side
    642,255.45x = 355,479,904,287.52
  5. Step 5: Solve for x
    x = 355,479,904,287.52/642,255.45
  6. Step 6: Final answer
    x = 553,486.79

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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.