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Finding the Fourth Proportional to 399,318.76, 551,055.72 and 218,030.14

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Solution

The fourth proportional to 399,318.76, 551,055.72 and 218,030.14 is: 300,879.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,318.76 : 551,055.72 = 218,030.14 : x
  2. Step 2: Convert to fraction form
    399,318.76/551,055.72 = 218,030.14/x
  3. Step 3: Cross multiply
    399,318.76x = 551,055.72 × 218,030.14
  4. Step 4: Simplify right side
    399,318.76x = 120,146,755,779.40
  5. Step 5: Solve for x
    x = 120,146,755,779.40/399,318.76
  6. Step 6: Final answer
    x = 300,879.32

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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.