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Finding the Fourth Proportional to 81,238.60, 112,108.50 and 45,428.20

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Solution

The fourth proportional to 81,238.60, 112,108.50 and 45,428.20 is: 62,690.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,238.60 : 112,108.50 = 45,428.20 : x
  2. Step 2: Convert to fraction form
    81,238.60/112,108.50 = 45,428.20/x
  3. Step 3: Cross multiply
    81,238.60x = 112,108.50 × 45,428.20
  4. Step 4: Simplify right side
    81,238.60x = 5,092,887,359.70
  5. Step 5: Solve for x
    x = 5,092,887,359.70/81,238.60
  6. Step 6: Final answer
    x = 62,690.49

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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.