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Finding the Fourth Proportional to 56.28, 84.78 and 47.91

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Solution

The fourth proportional to 56.28, 84.78 and 47.91 is: 72.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.28 : 84.78 = 47.91 : x
  2. Step 2: Convert to fraction form
    56.28/84.78 = 47.91/x
  3. Step 3: Cross multiply
    56.28x = 84.78 × 47.91
  4. Step 4: Simplify right side
    56.28x = 4,061.81
  5. Step 5: Solve for x
    x = 4,061.81/56.28
  6. Step 6: Final answer
    x = 72.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.