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Finding the Fourth Proportional to 18,712.76, 28,069.12 and 9,478.76

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Solution

The fourth proportional to 18,712.76, 28,069.12 and 9,478.76 is: 14,218.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.76 : 28,069.12 = 9,478.76 : x
  2. Step 2: Convert to fraction form
    18,712.76/28,069.12 = 9,478.76/x
  3. Step 3: Cross multiply
    18,712.76x = 28,069.12 × 9,478.76
  4. Step 4: Simplify right side
    18,712.76x = 266,060,451.89
  5. Step 5: Solve for x
    x = 266,060,451.89/18,712.76
  6. Step 6: Final answer
    x = 14,218.13

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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.