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Finding the Fourth Proportional to 103.32, 142.32 and 91.08

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Solution

The fourth proportional to 103.32, 142.32 and 91.08 is: 125.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.32 : 142.32 = 91.08 : x
  2. Step 2: Convert to fraction form
    103.32/142.32 = 91.08/x
  3. Step 3: Cross multiply
    103.32x = 142.32 × 91.08
  4. Step 4: Simplify right side
    103.32x = 12,962.51
  5. Step 5: Solve for x
    x = 12,962.51/103.32
  6. Step 6: Final answer
    x = 125.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.