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Finding the Fourth Proportional to 72,617.20, 108,904.20 and 28,218.40

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Solution

The fourth proportional to 72,617.20, 108,904.20 and 28,218.40 is: 42,319.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,617.20 : 108,904.20 = 28,218.40 : x
  2. Step 2: Convert to fraction form
    72,617.20/108,904.20 = 28,218.40/x
  3. Step 3: Cross multiply
    72,617.20x = 108,904.20 × 28,218.40
  4. Step 4: Simplify right side
    72,617.20x = 3,073,102,277.28
  5. Step 5: Solve for x
    x = 3,073,102,277.28/72,617.20
  6. Step 6: Final answer
    x = 42,319.21

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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.