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Finding the Fourth Proportional to 89,929.80, 134,894.70 and 86,090.40

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Solution

The fourth proportional to 89,929.80, 134,894.70 and 86,090.40 is: 129,135.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,929.80 : 134,894.70 = 86,090.40 : x
  2. Step 2: Convert to fraction form
    89,929.80/134,894.70 = 86,090.40/x
  3. Step 3: Cross multiply
    89,929.80x = 134,894.70 × 86,090.40
  4. Step 4: Simplify right side
    89,929.80x = 11,613,138,680.88
  5. Step 5: Solve for x
    x = 11,613,138,680.88/89,929.80
  6. Step 6: Final answer
    x = 129,135.60

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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.