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Finding the Fourth Proportional to 81,156.34, 112,026.96 and 72,643.42

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Solution

The fourth proportional to 81,156.34, 112,026.96 and 72,643.42 is: 100,275.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,156.34 : 112,026.96 = 72,643.42 : x
  2. Step 2: Convert to fraction form
    81,156.34/112,026.96 = 72,643.42/x
  3. Step 3: Cross multiply
    81,156.34x = 112,026.96 × 72,643.42
  4. Step 4: Simplify right side
    81,156.34x = 8,138,021,506.60
  5. Step 5: Solve for x
    x = 8,138,021,506.60/81,156.34
  6. Step 6: Final answer
    x = 100,275.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.