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Finding the Fourth Proportional to 108,717.21, 150,031.28 and 65,690.73

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Solution

The fourth proportional to 108,717.21, 150,031.28 and 65,690.73 is: 90,654.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,717.21 : 150,031.28 = 65,690.73 : x
  2. Step 2: Convert to fraction form
    108,717.21/150,031.28 = 65,690.73/x
  3. Step 3: Cross multiply
    108,717.21x = 150,031.28 × 65,690.73
  4. Step 4: Simplify right side
    108,717.21x = 9,855,663,977.58
  5. Step 5: Solve for x
    x = 9,855,663,977.58/108,717.21
  6. Step 6: Final answer
    x = 90,654.13

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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.