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Finding the Fourth Proportional to 98,793.20, 136,689 and 86,254.40

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Solution

The fourth proportional to 98,793.20, 136,689 and 86,254.40 is: 119,340.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,793.20 : 136,689 = 86,254.40 : x
  2. Step 2: Convert to fraction form
    98,793.20/136,689 = 86,254.40/x
  3. Step 3: Cross multiply
    98,793.20x = 136,689 × 86,254.40
  4. Step 4: Simplify right side
    98,793.20x = 11,790,027,681.60
  5. Step 5: Solve for x
    x = 11,790,027,681.60/98,793.20
  6. Step 6: Final answer
    x = 119,340.48

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1.5x scale

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.