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Finding the Fourth Proportional to 56.95, 85.47 and 52.90

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Solution

The fourth proportional to 56.95, 85.47 and 52.90 is: 79.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.95 : 85.47 = 52.90 : x
  2. Step 2: Convert to fraction form
    56.95/85.47 = 52.90/x
  3. Step 3: Cross multiply
    56.95x = 85.47 × 52.90
  4. Step 4: Simplify right side
    56.95x = 4,521.15
  5. Step 5: Solve for x
    x = 4,521.15/56.95
  6. Step 6: Final answer
    x = 79.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.