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Finding the Fourth Proportional to 100.45, 150.40 and 59.79

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Solution

The fourth proportional to 100.45, 150.40 and 59.79 is: 89.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.45 : 150.40 = 59.79 : x
  2. Step 2: Convert to fraction form
    100.45/150.40 = 59.79/x
  3. Step 3: Cross multiply
    100.45x = 150.40 × 59.79
  4. Step 4: Simplify right side
    100.45x = 8,992.42
  5. Step 5: Solve for x
    x = 8,992.42/100.45
  6. Step 6: Final answer
    x = 89.52

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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.