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Finding the Fourth Proportional to 390,040.80, 585,061.20 and 239,793.90

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Solution

The fourth proportional to 390,040.80, 585,061.20 and 239,793.90 is: 359,690.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,040.80 : 585,061.20 = 239,793.90 : x
  2. Step 2: Convert to fraction form
    390,040.80/585,061.20 = 239,793.90/x
  3. Step 3: Cross multiply
    390,040.80x = 585,061.20 × 239,793.90
  4. Step 4: Simplify right side
    390,040.80x = 140,294,106,886.68
  5. Step 5: Solve for x
    x = 140,294,106,886.68/390,040.80
  6. Step 6: Final answer
    x = 359,690.85

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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.