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Finding the Fourth Proportional to 72,495.20, 108,775.20 and 25,781.60

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Solution

The fourth proportional to 72,495.20, 108,775.20 and 25,781.60 is: 38,683.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,495.20 : 108,775.20 = 25,781.60 : x
  2. Step 2: Convert to fraction form
    72,495.20/108,775.20 = 25,781.60/x
  3. Step 3: Cross multiply
    72,495.20x = 108,775.20 × 25,781.60
  4. Step 4: Simplify right side
    72,495.20x = 2,804,398,696.32
  5. Step 5: Solve for x
    x = 2,804,398,696.32/72,495.20
  6. Step 6: Final answer
    x = 38,683.92

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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.