Home / 72,219.92-99,661.55-40,391.78

Finding the Fourth Proportional to 72,219.92, 99,661.55 and 40,391.78

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Solution

The fourth proportional to 72,219.92, 99,661.55 and 40,391.78 is: 55,739.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,219.92 : 99,661.55 = 40,391.78 : x
  2. Step 2: Convert to fraction form
    72,219.92/99,661.55 = 40,391.78/x
  3. Step 3: Cross multiply
    72,219.92x = 99,661.55 × 40,391.78
  4. Step 4: Simplify right side
    72,219.92x = 4,025,506,701.79
  5. Step 5: Solve for x
    x = 4,025,506,701.79/72,219.92
  6. Step 6: Final answer
    x = 55,739.57

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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.