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Finding the Fourth Proportional to 280,952.40, 421,428.60 and 81,279.30

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Solution

The fourth proportional to 280,952.40, 421,428.60 and 81,279.30 is: 121,918.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,952.40 : 421,428.60 = 81,279.30 : x
  2. Step 2: Convert to fraction form
    280,952.40/421,428.60 = 81,279.30/x
  3. Step 3: Cross multiply
    280,952.40x = 421,428.60 × 81,279.30
  4. Step 4: Simplify right side
    280,952.40x = 34,253,421,607.98
  5. Step 5: Solve for x
    x = 34,253,421,607.98/280,952.40
  6. Step 6: Final answer
    x = 121,918.95

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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.