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Finding the Fourth Proportional to 100.15, 150.29 and 52.09

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Solution

The fourth proportional to 100.15, 150.29 and 52.09 is: 78.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.15 : 150.29 = 52.09 : x
  2. Step 2: Convert to fraction form
    100.15/150.29 = 52.09/x
  3. Step 3: Cross multiply
    100.15x = 150.29 × 52.09
  4. Step 4: Simplify right side
    100.15x = 7,828.61
  5. Step 5: Solve for x
    x = 7,828.61/100.15
  6. Step 6: Final answer
    x = 78.17

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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.