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Finding the Fourth Proportional to 72,710.20, 109,043.70 and 28,311.40

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Solution

The fourth proportional to 72,710.20, 109,043.70 and 28,311.40 is: 42,458.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,710.20 : 109,043.70 = 28,311.40 : x
  2. Step 2: Convert to fraction form
    72,710.20/109,043.70 = 28,311.40/x
  3. Step 3: Cross multiply
    72,710.20x = 109,043.70 × 28,311.40
  4. Step 4: Simplify right side
    72,710.20x = 3,087,179,808.18
  5. Step 5: Solve for x
    x = 3,087,179,808.18/72,710.20
  6. Step 6: Final answer
    x = 42,458.69

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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.