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Finding the Fourth Proportional to 102.61, 153.86 and 70.17

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Solution

The fourth proportional to 102.61, 153.86 and 70.17 is: 105.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.61 : 153.86 = 70.17 : x
  2. Step 2: Convert to fraction form
    102.61/153.86 = 70.17/x
  3. Step 3: Cross multiply
    102.61x = 153.86 × 70.17
  4. Step 4: Simplify right side
    102.61x = 10,795.43
  5. Step 5: Solve for x
    x = 10,795.43/102.61
  6. Step 6: Final answer
    x = 105.21

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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.