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Finding the Fourth Proportional to 142.79, 214.58 and 85.02

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Solution

The fourth proportional to 142.79, 214.58 and 85.02 is: 127.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.79 : 214.58 = 85.02 : x
  2. Step 2: Convert to fraction form
    142.79/214.58 = 85.02/x
  3. Step 3: Cross multiply
    142.79x = 214.58 × 85.02
  4. Step 4: Simplify right side
    142.79x = 18,244.21
  5. Step 5: Solve for x
    x = 18,244.21/142.79
  6. Step 6: Final answer
    x = 127.77

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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.