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Finding the Fourth Proportional to 31,872.70, 47,810.85 and 9,686.80

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Solution

The fourth proportional to 31,872.70, 47,810.85 and 9,686.80 is: 14,530.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,872.70 : 47,810.85 = 9,686.80 : x
  2. Step 2: Convert to fraction form
    31,872.70/47,810.85 = 9,686.80/x
  3. Step 3: Cross multiply
    31,872.70x = 47,810.85 × 9,686.80
  4. Step 4: Simplify right side
    31,872.70x = 463,134,141.78
  5. Step 5: Solve for x
    x = 463,134,141.78/31,872.70
  6. Step 6: Final answer
    x = 14,530.75

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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.