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Finding the Fourth Proportional to 15,700.38, 21,670.25 and 8,989.88

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Solution

The fourth proportional to 15,700.38, 21,670.25 and 8,989.88 is: 12,408.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,700.38 : 21,670.25 = 8,989.88 : x
  2. Step 2: Convert to fraction form
    15,700.38/21,670.25 = 8,989.88/x
  3. Step 3: Cross multiply
    15,700.38x = 21,670.25 × 8,989.88
  4. Step 4: Simplify right side
    15,700.38x = 194,812,793.77
  5. Step 5: Solve for x
    x = 194,812,793.77/15,700.38
  6. Step 6: Final answer
    x = 12,408.16

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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.