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Finding the Fourth Proportional to 47.28, 65.18 and 39.08

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Solution

The fourth proportional to 47.28, 65.18 and 39.08 is: 53.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.28 : 65.18 = 39.08 : x
  2. Step 2: Convert to fraction form
    47.28/65.18 = 39.08/x
  3. Step 3: Cross multiply
    47.28x = 65.18 × 39.08
  4. Step 4: Simplify right side
    47.28x = 2,547.23
  5. Step 5: Solve for x
    x = 2,547.23/47.28
  6. Step 6: Final answer
    x = 53.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.