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Finding the Fourth Proportional to 100.77, 150.85 and 90.34

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Solution

The fourth proportional to 100.77, 150.85 and 90.34 is: 135.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.77 : 150.85 = 90.34 : x
  2. Step 2: Convert to fraction form
    100.77/150.85 = 90.34/x
  3. Step 3: Cross multiply
    100.77x = 150.85 × 90.34
  4. Step 4: Simplify right side
    100.77x = 13,627.79
  5. Step 5: Solve for x
    x = 13,627.79/100.77
  6. Step 6: Final answer
    x = 135.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.