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Finding the Fourth Proportional to 100.71, 149.85 and 100.35

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Solution

The fourth proportional to 100.71, 149.85 and 100.35 is: 149.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.71 : 149.85 = 100.35 : x
  2. Step 2: Convert to fraction form
    100.71/149.85 = 100.35/x
  3. Step 3: Cross multiply
    100.71x = 149.85 × 100.35
  4. Step 4: Simplify right side
    100.71x = 15,037.45
  5. Step 5: Solve for x
    x = 15,037.45/100.71
  6. Step 6: Final answer
    x = 149.31

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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.