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Finding the Fourth Proportional to 63.40, 87.60 and 47.08

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Solution

The fourth proportional to 63.40, 87.60 and 47.08 is: 65.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.40 : 87.60 = 47.08 : x
  2. Step 2: Convert to fraction form
    63.40/87.60 = 47.08/x
  3. Step 3: Cross multiply
    63.40x = 87.60 × 47.08
  4. Step 4: Simplify right side
    63.40x = 4,124.21
  5. Step 5: Solve for x
    x = 4,124.21/63.40
  6. Step 6: Final answer
    x = 65.05

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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.