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Finding the Fourth Proportional to 72,791.19, 109,121.85 and 28,407.63

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Solution

The fourth proportional to 72,791.19, 109,121.85 and 28,407.63 is: 42,586.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,791.19 : 109,121.85 = 28,407.63 : x
  2. Step 2: Convert to fraction form
    72,791.19/109,121.85 = 28,407.63/x
  3. Step 3: Cross multiply
    72,791.19x = 109,121.85 × 28,407.63
  4. Step 4: Simplify right side
    72,791.19x = 3,099,893,139.72
  5. Step 5: Solve for x
    x = 3,099,893,139.72/72,791.19
  6. Step 6: Final answer
    x = 42,586.10

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1.5x scale

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.