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Finding the Fourth Proportional to 103,686.67, 155,836.74 and 86,031.86

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Solution

The fourth proportional to 103,686.67, 155,836.74 and 86,031.86 is: 129,302.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,686.67 : 155,836.74 = 86,031.86 : x
  2. Step 2: Convert to fraction form
    103,686.67/155,836.74 = 86,031.86/x
  3. Step 3: Cross multiply
    103,686.67x = 155,836.74 × 86,031.86
  4. Step 4: Simplify right side
    103,686.67x = 13,406,924,598.54
  5. Step 5: Solve for x
    x = 13,406,924,598.54/103,686.67
  6. Step 6: Final answer
    x = 129,302.30

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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.