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Finding the Fourth Proportional to 72,616.80, 108,892.80 and 28,228.80

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Solution

The fourth proportional to 72,616.80, 108,892.80 and 28,228.80 is: 42,330.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,616.80 : 108,892.80 = 28,228.80 : x
  2. Step 2: Convert to fraction form
    72,616.80/108,892.80 = 28,228.80/x
  3. Step 3: Cross multiply
    72,616.80x = 108,892.80 × 28,228.80
  4. Step 4: Simplify right side
    72,616.80x = 3,073,913,072.64
  5. Step 5: Solve for x
    x = 3,073,913,072.64/72,616.80
  6. Step 6: Final answer
    x = 42,330.60

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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.