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Finding the Fourth Proportional to 72,612.80, 108,919.20 and 65,931.20

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Solution

The fourth proportional to 72,612.80, 108,919.20 and 65,931.20 is: 98,896.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,612.80 : 108,919.20 = 65,931.20 : x
  2. Step 2: Convert to fraction form
    72,612.80/108,919.20 = 65,931.20/x
  3. Step 3: Cross multiply
    72,612.80x = 108,919.20 × 65,931.20
  4. Step 4: Simplify right side
    72,612.80x = 7,181,173,559.04
  5. Step 5: Solve for x
    x = 7,181,173,559.04/72,612.80
  6. Step 6: Final answer
    x = 98,896.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.