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Finding the Fourth Proportional to 426,520.40, 639,473.40 and 239,589.20

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Solution

The fourth proportional to 426,520.40, 639,473.40 and 239,589.20 is: 359,211.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,520.40 : 639,473.40 = 239,589.20 : x
  2. Step 2: Convert to fraction form
    426,520.40/639,473.40 = 239,589.20/x
  3. Step 3: Cross multiply
    426,520.40x = 639,473.40 × 239,589.20
  4. Step 4: Simplify right side
    426,520.40x = 153,210,920,327.28
  5. Step 5: Solve for x
    x = 153,210,920,327.28/426,520.40
  6. Step 6: Final answer
    x = 359,211.24

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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.