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Finding the Fourth Proportional to 390,802.40, 585,512.40 and 331,359.20

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Solution

The fourth proportional to 390,802.40, 585,512.40 and 331,359.20 is: 496,452.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,802.40 : 585,512.40 = 331,359.20 : x
  2. Step 2: Convert to fraction form
    390,802.40/585,512.40 = 331,359.20/x
  3. Step 3: Cross multiply
    390,802.40x = 585,512.40 × 331,359.20
  4. Step 4: Simplify right side
    390,802.40x = 194,014,920,454.08
  5. Step 5: Solve for x
    x = 194,014,920,454.08/390,802.40
  6. Step 6: Final answer
    x = 496,452.74

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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.