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Finding the Fourth Proportional to 399,655.31, 551,523.46 and 218,368.53

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Solution

The fourth proportional to 399,655.31, 551,523.46 and 218,368.53 is: 301,348.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,655.31 : 551,523.46 = 218,368.53 : x
  2. Step 2: Convert to fraction form
    399,655.31/551,523.46 = 218,368.53/x
  3. Step 3: Cross multiply
    399,655.31x = 551,523.46 × 218,368.53
  4. Step 4: Simplify right side
    399,655.31x = 120,435,367,220.71
  5. Step 5: Solve for x
    x = 120,435,367,220.71/399,655.31
  6. Step 6: Final answer
    x = 301,348.10

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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.