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Finding the Fourth Proportional to 390,517.42, 585,551.88 and 153,730.90

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Solution

The fourth proportional to 390,517.42, 585,551.88 and 153,730.90 is: 230,508.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,517.42 : 585,551.88 = 153,730.90 : x
  2. Step 2: Convert to fraction form
    390,517.42/585,551.88 = 153,730.90/x
  3. Step 3: Cross multiply
    390,517.42x = 585,551.88 × 153,730.90
  4. Step 4: Simplify right side
    390,517.42x = 90,017,417,509.09
  5. Step 5: Solve for x
    x = 90,017,417,509.09/390,517.42
  6. Step 6: Final answer
    x = 230,508.07

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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.