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Finding the Fourth Proportional to 28,559.20, 42,838.80 and 21,998.20

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Solution

The fourth proportional to 28,559.20, 42,838.80 and 21,998.20 is: 32,997.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,559.20 : 42,838.80 = 21,998.20 : x
  2. Step 2: Convert to fraction form
    28,559.20/42,838.80 = 21,998.20/x
  3. Step 3: Cross multiply
    28,559.20x = 42,838.80 × 21,998.20
  4. Step 4: Simplify right side
    28,559.20x = 942,376,490.16
  5. Step 5: Solve for x
    x = 942,376,490.16/28,559.20
  6. Step 6: Final answer
    x = 32,997.30

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Double scale
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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.