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Finding the Fourth Proportional to 52.85, 78.98 and 45.56

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Solution

The fourth proportional to 52.85, 78.98 and 45.56 is: 68.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.85 : 78.98 = 45.56 : x
  2. Step 2: Convert to fraction form
    52.85/78.98 = 45.56/x
  3. Step 3: Cross multiply
    52.85x = 78.98 × 45.56
  4. Step 4: Simplify right side
    52.85x = 3,598.30
  5. Step 5: Solve for x
    x = 3,598.30/52.85
  6. Step 6: Final answer
    x = 68.08

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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.