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Finding the Fourth Proportional to 102.86, 153.20 and 98.18

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Solution

The fourth proportional to 102.86, 153.20 and 98.18 is: 146.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.86 : 153.20 = 98.18 : x
  2. Step 2: Convert to fraction form
    102.86/153.20 = 98.18/x
  3. Step 3: Cross multiply
    102.86x = 153.20 × 98.18
  4. Step 4: Simplify right side
    102.86x = 15,041.18
  5. Step 5: Solve for x
    x = 15,041.18/102.86
  6. Step 6: Final answer
    x = 146.23

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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.