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Finding the Fourth Proportional to 72,423.60, 108,640.80 and 25,670.40

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Solution

The fourth proportional to 72,423.60, 108,640.80 and 25,670.40 is: 38,507.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,423.60 : 108,640.80 = 25,670.40 : x
  2. Step 2: Convert to fraction form
    72,423.60/108,640.80 = 25,670.40/x
  3. Step 3: Cross multiply
    72,423.60x = 108,640.80 × 25,670.40
  4. Step 4: Simplify right side
    72,423.60x = 2,788,852,792.32
  5. Step 5: Solve for x
    x = 2,788,852,792.32/72,423.60
  6. Step 6: Final answer
    x = 38,507.51

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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.