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Finding the Fourth Proportional to 399,332.31, 551,100.90 and 218,061.06

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Solution

The fourth proportional to 399,332.31, 551,100.90 and 218,061.06 is: 300,936.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,332.31 : 551,100.90 = 218,061.06 : x
  2. Step 2: Convert to fraction form
    399,332.31/551,100.90 = 218,061.06/x
  3. Step 3: Cross multiply
    399,332.31x = 551,100.90 × 218,061.06
  4. Step 4: Simplify right side
    399,332.31x = 120,173,646,420.95
  5. Step 5: Solve for x
    x = 120,173,646,420.95/399,332.31
  6. Step 6: Final answer
    x = 300,936.45

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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.