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Finding the Fourth Proportional to 144.00, 215.71 and 66.86

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Solution

The fourth proportional to 144.00, 215.71 and 66.86 is: 100.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.00 : 215.71 = 66.86 : x
  2. Step 2: Convert to fraction form
    144.00/215.71 = 66.86/x
  3. Step 3: Cross multiply
    144.00x = 215.71 × 66.86
  4. Step 4: Simplify right side
    144.00x = 14,421.12
  5. Step 5: Solve for x
    x = 14,421.12/144.00
  6. Step 6: Final answer
    x = 100.15

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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.