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Finding the Fourth Proportional to 72,046.70, 99,424.56 and 40,215.60

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Solution

The fourth proportional to 72,046.70, 99,424.56 and 40,215.60 is: 55,497.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,046.70 : 99,424.56 = 40,215.60 : x
  2. Step 2: Convert to fraction form
    72,046.70/99,424.56 = 40,215.60/x
  3. Step 3: Cross multiply
    72,046.70x = 99,424.56 × 40,215.60
  4. Step 4: Simplify right side
    72,046.70x = 3,998,418,335.14
  5. Step 5: Solve for x
    x = 3,998,418,335.14/72,046.70
  6. Step 6: Final answer
    x = 55,497.59

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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.