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Finding the Fourth Proportional to 72,647.60, 108,987.60 and 28,270.40

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Solution

The fourth proportional to 72,647.60, 108,987.60 and 28,270.40 is: 42,411.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,647.60 : 108,987.60 = 28,270.40 : x
  2. Step 2: Convert to fraction form
    72,647.60/108,987.60 = 28,270.40/x
  3. Step 3: Cross multiply
    72,647.60x = 108,987.60 × 28,270.40
  4. Step 4: Simplify right side
    72,647.60x = 3,081,123,047.04
  5. Step 5: Solve for x
    x = 3,081,123,047.04/72,647.60
  6. Step 6: Final answer
    x = 42,411.90

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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.