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Finding the Fourth Proportional to 98.51, 148.51 and 91.91

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Solution

The fourth proportional to 98.51, 148.51 and 91.91 is: 138.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.51 : 148.51 = 91.91 : x
  2. Step 2: Convert to fraction form
    98.51/148.51 = 91.91/x
  3. Step 3: Cross multiply
    98.51x = 148.51 × 91.91
  4. Step 4: Simplify right side
    98.51x = 13,648.58
  5. Step 5: Solve for x
    x = 13,648.58/98.51
  6. Step 6: Final answer
    x = 138.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.