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Finding the Fourth Proportional to 28,305.60, 42,458.40 and 20,432.40

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Solution

The fourth proportional to 28,305.60, 42,458.40 and 20,432.40 is: 30,648.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,305.60 : 42,458.40 = 20,432.40 : x
  2. Step 2: Convert to fraction form
    28,305.60/42,458.40 = 20,432.40/x
  3. Step 3: Cross multiply
    28,305.60x = 42,458.40 × 20,432.40
  4. Step 4: Simplify right side
    28,305.60x = 867,527,012.16
  5. Step 5: Solve for x
    x = 867,527,012.16/28,305.60
  6. Step 6: Final answer
    x = 30,648.60

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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.