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Finding the Fourth Proportional to 390,879.60, 587,572.20 and 363,145.20

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Solution

The fourth proportional to 390,879.60, 587,572.20 and 363,145.20 is: 545,881.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,879.60 : 587,572.20 = 363,145.20 : x
  2. Step 2: Convert to fraction form
    390,879.60/587,572.20 = 363,145.20/x
  3. Step 3: Cross multiply
    390,879.60x = 587,572.20 × 363,145.20
  4. Step 4: Simplify right side
    390,879.60x = 213,374,024,083.44
  5. Step 5: Solve for x
    x = 213,374,024,083.44/390,879.60
  6. Step 6: Final answer
    x = 545,881.71

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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.