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Finding the Fourth Proportional to 98.60, 147.78 and 40.76

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Solution

The fourth proportional to 98.60, 147.78 and 40.76 is: 61.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.60 : 147.78 = 40.76 : x
  2. Step 2: Convert to fraction form
    98.60/147.78 = 40.76/x
  3. Step 3: Cross multiply
    98.60x = 147.78 × 40.76
  4. Step 4: Simplify right side
    98.60x = 6,023.51
  5. Step 5: Solve for x
    x = 6,023.51/98.60
  6. Step 6: Final answer
    x = 61.09

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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.