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Finding the Fourth Proportional to 100.50, 150.39 and 64.20

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Solution

The fourth proportional to 100.50, 150.39 and 64.20 is: 96.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.50 : 150.39 = 64.20 : x
  2. Step 2: Convert to fraction form
    100.50/150.39 = 64.20/x
  3. Step 3: Cross multiply
    100.50x = 150.39 × 64.20
  4. Step 4: Simplify right side
    100.50x = 9,655.04
  5. Step 5: Solve for x
    x = 9,655.04/100.50
  6. Step 6: Final answer
    x = 96.07

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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.