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Finding the Fourth Proportional to 86,988.46, 120,101.90 and 66,809.28

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Solution

The fourth proportional to 86,988.46, 120,101.90 and 66,809.28 is: 92,241.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,988.46 : 120,101.90 = 66,809.28 : x
  2. Step 2: Convert to fraction form
    86,988.46/120,101.90 = 66,809.28/x
  3. Step 3: Cross multiply
    86,988.46x = 120,101.90 × 66,809.28
  4. Step 4: Simplify right side
    86,988.46x = 8,023,921,465.63
  5. Step 5: Solve for x
    x = 8,023,921,465.63/86,988.46
  6. Step 6: Final answer
    x = 92,241.22

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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.