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Finding the Fourth Proportional to 147.71, 221.58 and 139.16

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Solution

The fourth proportional to 147.71, 221.58 and 139.16 is: 208.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.71 : 221.58 = 139.16 : x
  2. Step 2: Convert to fraction form
    147.71/221.58 = 139.16/x
  3. Step 3: Cross multiply
    147.71x = 221.58 × 139.16
  4. Step 4: Simplify right side
    147.71x = 30,835.63
  5. Step 5: Solve for x
    x = 30,835.63/147.71
  6. Step 6: Final answer
    x = 208.75

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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.