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Finding the Fourth Proportional to 92,421.60, 138,632.40 and 86,589.60

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Solution

The fourth proportional to 92,421.60, 138,632.40 and 86,589.60 is: 129,884.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,421.60 : 138,632.40 = 86,589.60 : x
  2. Step 2: Convert to fraction form
    92,421.60/138,632.40 = 86,589.60/x
  3. Step 3: Cross multiply
    92,421.60x = 138,632.40 × 86,589.60
  4. Step 4: Simplify right side
    92,421.60x = 12,004,124,063.04
  5. Step 5: Solve for x
    x = 12,004,124,063.04/92,421.60
  6. Step 6: Final answer
    x = 129,884.40

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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.