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Finding the Fourth Proportional to 100.49, 150.86 and 64.31

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Solution

The fourth proportional to 100.49, 150.86 and 64.31 is: 96.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.49 : 150.86 = 64.31 : x
  2. Step 2: Convert to fraction form
    100.49/150.86 = 64.31/x
  3. Step 3: Cross multiply
    100.49x = 150.86 × 64.31
  4. Step 4: Simplify right side
    100.49x = 9,701.21
  5. Step 5: Solve for x
    x = 9,701.21/100.49
  6. Step 6: Final answer
    x = 96.54

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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.