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Finding the Fourth Proportional to 72,012.80, 108,019.20 and 56,979.20

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Solution

The fourth proportional to 72,012.80, 108,019.20 and 56,979.20 is: 85,468.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,012.80 : 108,019.20 = 56,979.20 : x
  2. Step 2: Convert to fraction form
    72,012.80/108,019.20 = 56,979.20/x
  3. Step 3: Cross multiply
    72,012.80x = 108,019.20 × 56,979.20
  4. Step 4: Simplify right side
    72,012.80x = 6,154,847,600.64
  5. Step 5: Solve for x
    x = 6,154,847,600.64/72,012.80
  6. Step 6: Final answer
    x = 85,468.80

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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.