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Finding the Fourth Proportional to 56.72, 78.25 and 35.70

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Solution

The fourth proportional to 56.72, 78.25 and 35.70 is: 49.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.72 : 78.25 = 35.70 : x
  2. Step 2: Convert to fraction form
    56.72/78.25 = 35.70/x
  3. Step 3: Cross multiply
    56.72x = 78.25 × 35.70
  4. Step 4: Simplify right side
    56.72x = 2,792.96
  5. Step 5: Solve for x
    x = 2,792.96/56.72
  6. Step 6: Final answer
    x = 49.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.