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Finding the Fourth Proportional to 418,395.15, 577,663.36 and 321,426.29

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Solution

The fourth proportional to 418,395.15, 577,663.36 and 321,426.29 is: 443,781.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,395.15 : 577,663.36 = 321,426.29 : x
  2. Step 2: Convert to fraction form
    418,395.15/577,663.36 = 321,426.29/x
  3. Step 3: Cross multiply
    418,395.15x = 577,663.36 × 321,426.29
  4. Step 4: Simplify right side
    418,395.15x = 185,676,191,314.33
  5. Step 5: Solve for x
    x = 185,676,191,314.33/418,395.15
  6. Step 6: Final answer
    x = 443,781.89

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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.