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Finding the Fourth Proportional to 98.88, 148.94 and 90.56

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Solution

The fourth proportional to 98.88, 148.94 and 90.56 is: 136.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.88 : 148.94 = 90.56 : x
  2. Step 2: Convert to fraction form
    98.88/148.94 = 90.56/x
  3. Step 3: Cross multiply
    98.88x = 148.94 × 90.56
  4. Step 4: Simplify right side
    98.88x = 13,486.81
  5. Step 5: Solve for x
    x = 13,486.81/98.88
  6. Step 6: Final answer
    x = 136.40

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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.