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Finding the Fourth Proportional to 18,921.32, 28,381.98 and 7,235.72

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Solution

The fourth proportional to 18,921.32, 28,381.98 and 7,235.72 is: 10,853.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.32 : 28,381.98 = 7,235.72 : x
  2. Step 2: Convert to fraction form
    18,921.32/28,381.98 = 7,235.72/x
  3. Step 3: Cross multiply
    18,921.32x = 28,381.98 × 7,235.72
  4. Step 4: Simplify right side
    18,921.32x = 205,364,060.33
  5. Step 5: Solve for x
    x = 205,364,060.33/18,921.32
  6. Step 6: Final answer
    x = 10,853.58

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Similar ratio
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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.