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Finding the Fourth Proportional to 142.84, 214.13 and 64.70

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Solution

The fourth proportional to 142.84, 214.13 and 64.70 is: 96.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.84 : 214.13 = 64.70 : x
  2. Step 2: Convert to fraction form
    142.84/214.13 = 64.70/x
  3. Step 3: Cross multiply
    142.84x = 214.13 × 64.70
  4. Step 4: Simplify right side
    142.84x = 13,853.14
  5. Step 5: Solve for x
    x = 13,853.14/142.84
  6. Step 6: Final answer
    x = 96.98

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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.