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Finding the Fourth Proportional to 72,149.80, 99,566.49 and 40,318.69

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Solution

The fourth proportional to 72,149.80, 99,566.49 and 40,318.69 is: 55,639.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,149.80 : 99,566.49 = 40,318.69 : x
  2. Step 2: Convert to fraction form
    72,149.80/99,566.49 = 40,318.69/x
  3. Step 3: Cross multiply
    72,149.80x = 99,566.49 × 40,318.69
  4. Step 4: Simplify right side
    72,149.80x = 4,014,390,444.70
  5. Step 5: Solve for x
    x = 4,014,390,444.70/72,149.80
  6. Step 6: Final answer
    x = 55,639.66

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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.