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Finding the Fourth Proportional to 71,909.92, 99,235.83 and 40,078.18

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Solution

The fourth proportional to 71,909.92, 99,235.83 and 40,078.18 is: 55,307.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,909.92 : 99,235.83 = 40,078.18 : x
  2. Step 2: Convert to fraction form
    71,909.92/99,235.83 = 40,078.18/x
  3. Step 3: Cross multiply
    71,909.92x = 99,235.83 × 40,078.18
  4. Step 4: Simplify right side
    71,909.92x = 3,977,191,457.19
  5. Step 5: Solve for x
    x = 3,977,191,457.19/71,909.92
  6. Step 6: Final answer
    x = 55,307.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.