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Finding the Fourth Proportional to 103.20, 155.51 and 86.46

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Solution

The fourth proportional to 103.20, 155.51 and 86.46 is: 130.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.20 : 155.51 = 86.46 : x
  2. Step 2: Convert to fraction form
    103.20/155.51 = 86.46/x
  3. Step 3: Cross multiply
    103.20x = 155.51 × 86.46
  4. Step 4: Simplify right side
    103.20x = 13,444.96
  5. Step 5: Solve for x
    x = 13,444.96/103.20
  6. Step 6: Final answer
    x = 130.28

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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.