Home / 12,690.72-17,512.68-7,385.52

Finding the Fourth Proportional to 12,690.72, 17,512.68 and 7,385.52

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Solution

The fourth proportional to 12,690.72, 17,512.68 and 7,385.52 is: 10,191.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.72 : 17,512.68 = 7,385.52 : x
  2. Step 2: Convert to fraction form
    12,690.72/17,512.68 = 7,385.52/x
  3. Step 3: Cross multiply
    12,690.72x = 17,512.68 × 7,385.52
  4. Step 4: Simplify right side
    12,690.72x = 129,340,248.39
  5. Step 5: Solve for x
    x = 129,340,248.39/12,690.72
  6. Step 6: Final answer
    x = 10,191.72

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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.