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Finding the Fourth Proportional to 103.19, 153.98 and 91.64

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Solution

The fourth proportional to 103.19, 153.98 and 91.64 is: 136.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.19 : 153.98 = 91.64 : x
  2. Step 2: Convert to fraction form
    103.19/153.98 = 91.64/x
  3. Step 3: Cross multiply
    103.19x = 153.98 × 91.64
  4. Step 4: Simplify right side
    103.19x = 14,109.50
  5. Step 5: Solve for x
    x = 14,109.50/103.19
  6. Step 6: Final answer
    x = 136.74

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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.