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Finding the Fourth Proportional to 98.35, 147.55 and 86.05

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Solution

The fourth proportional to 98.35, 147.55 and 86.05 is: 129.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.35 : 147.55 = 86.05 : x
  2. Step 2: Convert to fraction form
    98.35/147.55 = 86.05/x
  3. Step 3: Cross multiply
    98.35x = 147.55 × 86.05
  4. Step 4: Simplify right side
    98.35x = 12,695.98
  5. Step 5: Solve for x
    x = 12,695.98/98.35
  6. Step 6: Final answer
    x = 129.09

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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.