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Finding the Fourth Proportional to 52.86, 78.71 and 49.75

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Solution

The fourth proportional to 52.86, 78.71 and 49.75 is: 74.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.86 : 78.71 = 49.75 : x
  2. Step 2: Convert to fraction form
    52.86/78.71 = 49.75/x
  3. Step 3: Cross multiply
    52.86x = 78.71 × 49.75
  4. Step 4: Simplify right side
    52.86x = 3,915.82
  5. Step 5: Solve for x
    x = 3,915.82/52.86
  6. Step 6: Final answer
    x = 74.08

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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.