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Finding the Fourth Proportional to 28,463.80, 42,695.68 and 7,687.28

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Solution

The fourth proportional to 28,463.80, 42,695.68 and 7,687.28 is: 11,530.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,463.80 : 42,695.68 = 7,687.28 : x
  2. Step 2: Convert to fraction form
    28,463.80/42,695.68 = 7,687.28/x
  3. Step 3: Cross multiply
    28,463.80x = 42,695.68 × 7,687.28
  4. Step 4: Simplify right side
    28,463.80x = 328,213,646.95
  5. Step 5: Solve for x
    x = 328,213,646.95/28,463.80
  6. Step 6: Final answer
    x = 11,530.91

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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.