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Finding the Fourth Proportional to 56.40, 84.72 and 49.79

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Solution

The fourth proportional to 56.40, 84.72 and 49.79 is: 74.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.40 : 84.72 = 49.79 : x
  2. Step 2: Convert to fraction form
    56.40/84.72 = 49.79/x
  3. Step 3: Cross multiply
    56.40x = 84.72 × 49.79
  4. Step 4: Simplify right side
    56.40x = 4,218.23
  5. Step 5: Solve for x
    x = 4,218.23/56.40
  6. Step 6: Final answer
    x = 74.80

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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.