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Finding the Fourth Proportional to 8,472.80, 11,692.15 and 5,115.29

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Solution

The fourth proportional to 8,472.80, 11,692.15 and 5,115.29 is: 7,058.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,472.80 : 11,692.15 = 5,115.29 : x
  2. Step 2: Convert to fraction form
    8,472.80/11,692.15 = 5,115.29/x
  3. Step 3: Cross multiply
    8,472.80x = 11,692.15 × 5,115.29
  4. Step 4: Simplify right side
    8,472.80x = 59,808,754.42
  5. Step 5: Solve for x
    x = 59,808,754.42/8,472.80
  6. Step 6: Final answer
    x = 7,058.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.