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Finding the Fourth Proportional to 142.68, 214.16 and 74.25

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Solution

The fourth proportional to 142.68, 214.16 and 74.25 is: 111.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.68 : 214.16 = 74.25 : x
  2. Step 2: Convert to fraction form
    142.68/214.16 = 74.25/x
  3. Step 3: Cross multiply
    142.68x = 214.16 × 74.25
  4. Step 4: Simplify right side
    142.68x = 15,902.00
  5. Step 5: Solve for x
    x = 15,902.00/142.68
  6. Step 6: Final answer
    x = 111.45

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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.