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Finding the Fourth Proportional to 40,991.76, 61,489.08 and 13,290

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Solution

The fourth proportional to 40,991.76, 61,489.08 and 13,290 is: 19,935.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,991.76 : 61,489.08 = 13,290 : x
  2. Step 2: Convert to fraction form
    40,991.76/61,489.08 = 13,290/x
  3. Step 3: Cross multiply
    40,991.76x = 61,489.08 × 13,290
  4. Step 4: Simplify right side
    40,991.76x = 817,189,873.20
  5. Step 5: Solve for x
    x = 817,189,873.20/40,991.76
  6. Step 6: Final answer
    x = 19,935.47

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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.