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Finding the Fourth Proportional to 390,402.60, 585,613.62 and 109,917.96

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Solution

The fourth proportional to 390,402.60, 585,613.62 and 109,917.96 is: 164,879.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,402.60 : 585,613.62 = 109,917.96 : x
  2. Step 2: Convert to fraction form
    390,402.60/585,613.62 = 109,917.96/x
  3. Step 3: Cross multiply
    390,402.60x = 585,613.62 × 109,917.96
  4. Step 4: Simplify right side
    390,402.60x = 64,369,454,458.62
  5. Step 5: Solve for x
    x = 64,369,454,458.62/390,402.60
  6. Step 6: Final answer
    x = 164,879.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.