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Finding the Fourth Proportional to 72,709.20, 109,042.20 and 28,310.40

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Solution

The fourth proportional to 72,709.20, 109,042.20 and 28,310.40 is: 42,457.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,709.20 : 109,042.20 = 28,310.40 : x
  2. Step 2: Convert to fraction form
    72,709.20/109,042.20 = 28,310.40/x
  3. Step 3: Cross multiply
    72,709.20x = 109,042.20 × 28,310.40
  4. Step 4: Simplify right side
    72,709.20x = 3,087,028,298.88
  5. Step 5: Solve for x
    x = 3,087,028,298.88/72,709.20
  6. Step 6: Final answer
    x = 42,457.19

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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.