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Finding the Fourth Proportional to 56.40, 84.19 and 49.92

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Solution

The fourth proportional to 56.40, 84.19 and 49.92 is: 74.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.40 : 84.19 = 49.92 : x
  2. Step 2: Convert to fraction form
    56.40/84.19 = 49.92/x
  3. Step 3: Cross multiply
    56.40x = 84.19 × 49.92
  4. Step 4: Simplify right side
    56.40x = 4,202.76
  5. Step 5: Solve for x
    x = 4,202.76/56.40
  6. Step 6: Final answer
    x = 74.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.