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Finding the Fourth Proportional to 72,659.60, 109,005.60 and 28,282.40

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Solution

The fourth proportional to 72,659.60, 109,005.60 and 28,282.40 is: 42,429.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,659.60 : 109,005.60 = 28,282.40 : x
  2. Step 2: Convert to fraction form
    72,659.60/109,005.60 = 28,282.40/x
  3. Step 3: Cross multiply
    72,659.60x = 109,005.60 × 28,282.40
  4. Step 4: Simplify right side
    72,659.60x = 3,082,939,981.44
  5. Step 5: Solve for x
    x = 3,082,939,981.44/72,659.60
  6. Step 6: Final answer
    x = 42,429.91

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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.