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Finding the Fourth Proportional to 72,039.80, 99,424.32 and 40,215.32

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Solution

The fourth proportional to 72,039.80, 99,424.32 and 40,215.32 is: 55,502.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,039.80 : 99,424.32 = 40,215.32 : x
  2. Step 2: Convert to fraction form
    72,039.80/99,424.32 = 40,215.32/x
  3. Step 3: Cross multiply
    72,039.80x = 99,424.32 × 40,215.32
  4. Step 4: Simplify right side
    72,039.80x = 3,998,380,844.58
  5. Step 5: Solve for x
    x = 3,998,380,844.58/72,039.80
  6. Step 6: Final answer
    x = 55,502.39

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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.