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Finding the Fourth Proportional to 56.70, 77.86 and 45.70

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Solution

The fourth proportional to 56.70, 77.86 and 45.70 is: 62.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.70 : 77.86 = 45.70 : x
  2. Step 2: Convert to fraction form
    56.70/77.86 = 45.70/x
  3. Step 3: Cross multiply
    56.70x = 77.86 × 45.70
  4. Step 4: Simplify right side
    56.70x = 3,557.97
  5. Step 5: Solve for x
    x = 3,557.97/56.70
  6. Step 6: Final answer
    x = 62.75

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.