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Finding the Fourth Proportional to 106.67, 159.29 and 87.45

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Solution

The fourth proportional to 106.67, 159.29 and 87.45 is: 130.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.67 : 159.29 = 87.45 : x
  2. Step 2: Convert to fraction form
    106.67/159.29 = 87.45/x
  3. Step 3: Cross multiply
    106.67x = 159.29 × 87.45
  4. Step 4: Simplify right side
    106.67x = 13,929.47
  5. Step 5: Solve for x
    x = 13,929.47/106.67
  6. Step 6: Final answer
    x = 130.58

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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.