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Finding the Fourth Proportional to 40,989.76, 61,486.08 and 13,288

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Solution

The fourth proportional to 40,989.76, 61,486.08 and 13,288 is: 19,932.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,989.76 : 61,486.08 = 13,288 : x
  2. Step 2: Convert to fraction form
    40,989.76/61,486.08 = 13,288/x
  3. Step 3: Cross multiply
    40,989.76x = 61,486.08 × 13,288
  4. Step 4: Simplify right side
    40,989.76x = 817,027,031.04
  5. Step 5: Solve for x
    x = 817,027,031.04/40,989.76
  6. Step 6: Final answer
    x = 19,932.47

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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.