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Finding the Fourth Proportional to 98.25, 147.43 and 90.51

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Solution

The fourth proportional to 98.25, 147.43 and 90.51 is: 135.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.25 : 147.43 = 90.51 : x
  2. Step 2: Convert to fraction form
    98.25/147.43 = 90.51/x
  3. Step 3: Cross multiply
    98.25x = 147.43 × 90.51
  4. Step 4: Simplify right side
    98.25x = 13,343.89
  5. Step 5: Solve for x
    x = 13,343.89/98.25
  6. Step 6: Final answer
    x = 135.82

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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.