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Finding the Fourth Proportional to 52.15, 77.90 and 47.11

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Solution

The fourth proportional to 52.15, 77.90 and 47.11 is: 70.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.15 : 77.90 = 47.11 : x
  2. Step 2: Convert to fraction form
    52.15/77.90 = 47.11/x
  3. Step 3: Cross multiply
    52.15x = 77.90 × 47.11
  4. Step 4: Simplify right side
    52.15x = 3,669.87
  5. Step 5: Solve for x
    x = 3,669.87/52.15
  6. Step 6: Final answer
    x = 70.37

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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.