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Finding the Fourth Proportional to 261,025.60, 391,279.20 and 120,539.20

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Solution

The fourth proportional to 261,025.60, 391,279.20 and 120,539.20 is: 180,689.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,025.60 : 391,279.20 = 120,539.20 : x
  2. Step 2: Convert to fraction form
    261,025.60/391,279.20 = 120,539.20/x
  3. Step 3: Cross multiply
    261,025.60x = 391,279.20 × 120,539.20
  4. Step 4: Simplify right side
    261,025.60x = 47,164,481,744.64
  5. Step 5: Solve for x
    x = 47,164,481,744.64/261,025.60
  6. Step 6: Final answer
    x = 180,689.10

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1.5x scale

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.