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Finding the Fourth Proportional to 399,641.64, 551,499.03 and 218,349.68

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Solution

The fourth proportional to 399,641.64, 551,499.03 and 218,349.68 is: 301,319.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,641.64 : 551,499.03 = 218,349.68 : x
  2. Step 2: Convert to fraction form
    399,641.64/551,499.03 = 218,349.68/x
  3. Step 3: Cross multiply
    399,641.64x = 551,499.03 × 218,349.68
  4. Step 4: Simplify right side
    399,641.64x = 120,419,636,720.81
  5. Step 5: Solve for x
    x = 120,419,636,720.81/399,641.64
  6. Step 6: Final answer
    x = 301,319.04

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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.