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Finding the Fourth Proportional to 47.32, 70.86 and 42.79

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Solution

The fourth proportional to 47.32, 70.86 and 42.79 is: 64.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.32 : 70.86 = 42.79 : x
  2. Step 2: Convert to fraction form
    47.32/70.86 = 42.79/x
  3. Step 3: Cross multiply
    47.32x = 70.86 × 42.79
  4. Step 4: Simplify right side
    47.32x = 3,032.10
  5. Step 5: Solve for x
    x = 3,032.10/47.32
  6. Step 6: Final answer
    x = 64.08

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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.