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Finding the Fourth Proportional to 98.70, 147.15 and 90.03

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Solution

The fourth proportional to 98.70, 147.15 and 90.03 is: 134.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.70 : 147.15 = 90.03 : x
  2. Step 2: Convert to fraction form
    98.70/147.15 = 90.03/x
  3. Step 3: Cross multiply
    98.70x = 147.15 × 90.03
  4. Step 4: Simplify right side
    98.70x = 13,248.47
  5. Step 5: Solve for x
    x = 13,248.47/98.70
  6. Step 6: Final answer
    x = 134.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.