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Finding the Fourth Proportional to 71,991.40, 99,345.90 and 40,165.69

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Solution

The fourth proportional to 71,991.40, 99,345.90 and 40,165.69 is: 55,427.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,991.40 : 99,345.90 = 40,165.69 : x
  2. Step 2: Convert to fraction form
    71,991.40/99,345.90 = 40,165.69/x
  3. Step 3: Cross multiply
    71,991.40x = 99,345.90 × 40,165.69
  4. Step 4: Simplify right side
    71,991.40x = 3,990,296,622.17
  5. Step 5: Solve for x
    x = 3,990,296,622.17/71,991.40
  6. Step 6: Final answer
    x = 55,427.41

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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.