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Finding the Fourth Proportional to 28,442.40, 42,663.92 and 8,721.12

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Solution

The fourth proportional to 28,442.40, 42,663.92 and 8,721.12 is: 13,081.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,442.40 : 42,663.92 = 8,721.12 : x
  2. Step 2: Convert to fraction form
    28,442.40/42,663.92 = 8,721.12/x
  3. Step 3: Cross multiply
    28,442.40x = 42,663.92 × 8,721.12
  4. Step 4: Simplify right side
    28,442.40x = 372,077,165.99
  5. Step 5: Solve for x
    x = 372,077,165.99/28,442.40
  6. Step 6: Final answer
    x = 13,081.78

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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.