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Finding the Fourth Proportional to 100.40, 149.70 and 100.26

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Solution

The fourth proportional to 100.40, 149.70 and 100.26 is: 149.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.40 : 149.70 = 100.26 : x
  2. Step 2: Convert to fraction form
    100.40/149.70 = 100.26/x
  3. Step 3: Cross multiply
    100.40x = 149.70 × 100.26
  4. Step 4: Simplify right side
    100.40x = 15,008.92
  5. Step 5: Solve for x
    x = 15,008.92/100.40
  6. Step 6: Final answer
    x = 149.49

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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.