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Finding the Fourth Proportional to 106.71, 159.26 and 90.45

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Solution

The fourth proportional to 106.71, 159.26 and 90.45 is: 134.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.71 : 159.26 = 90.45 : x
  2. Step 2: Convert to fraction form
    106.71/159.26 = 90.45/x
  3. Step 3: Cross multiply
    106.71x = 159.26 × 90.45
  4. Step 4: Simplify right side
    106.71x = 14,404.61
  5. Step 5: Solve for x
    x = 14,404.61/106.71
  6. Step 6: Final answer
    x = 134.99

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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.