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Finding the Fourth Proportional to 100.87, 151.40 and 70.46

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Solution

The fourth proportional to 100.87, 151.40 and 70.46 is: 105.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.87 : 151.40 = 70.46 : x
  2. Step 2: Convert to fraction form
    100.87/151.40 = 70.46/x
  3. Step 3: Cross multiply
    100.87x = 151.40 × 70.46
  4. Step 4: Simplify right side
    100.87x = 10,667.29
  5. Step 5: Solve for x
    x = 10,667.29/100.87
  6. Step 6: Final answer
    x = 105.75

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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.