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Finding the Fourth Proportional to 28,291.60, 42,480.60 and 19,565.20

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Solution

The fourth proportional to 28,291.60, 42,480.60 and 19,565.20 is: 29,377.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,291.60 : 42,480.60 = 19,565.20 : x
  2. Step 2: Convert to fraction form
    28,291.60/42,480.60 = 19,565.20/x
  3. Step 3: Cross multiply
    28,291.60x = 42,480.60 × 19,565.20
  4. Step 4: Simplify right side
    28,291.60x = 831,141,435.12
  5. Step 5: Solve for x
    x = 831,141,435.12/28,291.60
  6. Step 6: Final answer
    x = 29,377.68

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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.