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Finding the Fourth Proportional to 52.89, 78.72 and 51.16

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Solution

The fourth proportional to 52.89, 78.72 and 51.16 is: 76.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.89 : 78.72 = 51.16 : x
  2. Step 2: Convert to fraction form
    52.89/78.72 = 51.16/x
  3. Step 3: Cross multiply
    52.89x = 78.72 × 51.16
  4. Step 4: Simplify right side
    52.89x = 4,027.32
  5. Step 5: Solve for x
    x = 4,027.32/52.89
  6. Step 6: Final answer
    x = 76.15

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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.