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Finding the Fourth Proportional to 399,715.43, 551,606.13 and 218,428.47

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Solution

The fourth proportional to 399,715.43, 551,606.13 and 218,428.47 is: 301,430.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,715.43 : 551,606.13 = 218,428.47 : x
  2. Step 2: Convert to fraction form
    399,715.43/551,606.13 = 218,428.47/x
  3. Step 3: Cross multiply
    399,715.43x = 551,606.13 × 218,428.47
  4. Step 4: Simplify right side
    399,715.43x = 120,486,483,018.52
  5. Step 5: Solve for x
    x = 120,486,483,018.52/399,715.43
  6. Step 6: Final answer
    x = 301,430.66

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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.