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Finding the Fourth Proportional to 72,153.60, 99,581.76 and 40,324.80

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Solution

The fourth proportional to 72,153.60, 99,581.76 and 40,324.80 is: 55,653.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,153.60 : 99,581.76 = 40,324.80 : x
  2. Step 2: Convert to fraction form
    72,153.60/99,581.76 = 40,324.80/x
  3. Step 3: Cross multiply
    72,153.60x = 99,581.76 × 40,324.80
  4. Step 4: Simplify right side
    72,153.60x = 4,015,614,555.65
  5. Step 5: Solve for x
    x = 4,015,614,555.65/72,153.60
  6. Step 6: Final answer
    x = 55,653.70

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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.