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Finding the Fourth Proportional to 18,939.84, 28,422.72 and 9,712.32

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Solution

The fourth proportional to 18,939.84, 28,422.72 and 9,712.32 is: 14,575.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.84 : 28,422.72 = 9,712.32 : x
  2. Step 2: Convert to fraction form
    18,939.84/28,422.72 = 9,712.32/x
  3. Step 3: Cross multiply
    18,939.84x = 28,422.72 × 9,712.32
  4. Step 4: Simplify right side
    18,939.84x = 276,050,551.91
  5. Step 5: Solve for x
    x = 276,050,551.91/18,939.84
  6. Step 6: Final answer
    x = 14,575.13

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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.