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Finding the Fourth Proportional to 12,471.20, 18,671.70 and 9,702.80

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Solution

The fourth proportional to 12,471.20, 18,671.70 and 9,702.80 is: 14,526.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,471.20 : 18,671.70 = 9,702.80 : x
  2. Step 2: Convert to fraction form
    12,471.20/18,671.70 = 9,702.80/x
  3. Step 3: Cross multiply
    12,471.20x = 18,671.70 × 9,702.80
  4. Step 4: Simplify right side
    12,471.20x = 181,167,770.76
  5. Step 5: Solve for x
    x = 181,167,770.76/12,471.20
  6. Step 6: Final answer
    x = 14,526.89

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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.