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Finding the Fourth Proportional to 53.57, 79.86 and 52.74

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Solution

The fourth proportional to 53.57, 79.86 and 52.74 is: 78.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.57 : 79.86 = 52.74 : x
  2. Step 2: Convert to fraction form
    53.57/79.86 = 52.74/x
  3. Step 3: Cross multiply
    53.57x = 79.86 × 52.74
  4. Step 4: Simplify right side
    53.57x = 4,211.82
  5. Step 5: Solve for x
    x = 4,211.82/53.57
  6. Step 6: Final answer
    x = 78.62

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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.