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Finding the Fourth Proportional to 28,489.60, 42,734.40 and 19,158.40

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Solution

The fourth proportional to 28,489.60, 42,734.40 and 19,158.40 is: 28,737.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,489.60 : 42,734.40 = 19,158.40 : x
  2. Step 2: Convert to fraction form
    28,489.60/42,734.40 = 19,158.40/x
  3. Step 3: Cross multiply
    28,489.60x = 42,734.40 × 19,158.40
  4. Step 4: Simplify right side
    28,489.60x = 818,722,728.96
  5. Step 5: Solve for x
    x = 818,722,728.96/28,489.60
  6. Step 6: Final answer
    x = 28,737.60

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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.