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Finding the Fourth Proportional to 71,972.60, 99,322.62 and 40,143.56

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Solution

The fourth proportional to 71,972.60, 99,322.62 and 40,143.56 is: 55,398.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,972.60 : 99,322.62 = 40,143.56 : x
  2. Step 2: Convert to fraction form
    71,972.60/99,322.62 = 40,143.56/x
  3. Step 3: Cross multiply
    71,972.60x = 99,322.62 × 40,143.56
  4. Step 4: Simplify right side
    71,972.60x = 3,987,163,555.33
  5. Step 5: Solve for x
    x = 3,987,163,555.33/71,972.60
  6. Step 6: Final answer
    x = 55,398.35

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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.