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Finding the Fourth Proportional to 148.64, 221.71 and 145.40

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Solution

The fourth proportional to 148.64, 221.71 and 145.40 is: 216.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.64 : 221.71 = 145.40 : x
  2. Step 2: Convert to fraction form
    148.64/221.71 = 145.40/x
  3. Step 3: Cross multiply
    148.64x = 221.71 × 145.40
  4. Step 4: Simplify right side
    148.64x = 32,236.63
  5. Step 5: Solve for x
    x = 32,236.63/148.64
  6. Step 6: Final answer
    x = 216.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.