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Finding the Fourth Proportional to 56.35, 77.65 and 51.15

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Solution

The fourth proportional to 56.35, 77.65 and 51.15 is: 70.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.35 : 77.65 = 51.15 : x
  2. Step 2: Convert to fraction form
    56.35/77.65 = 51.15/x
  3. Step 3: Cross multiply
    56.35x = 77.65 × 51.15
  4. Step 4: Simplify right side
    56.35x = 3,971.80
  5. Step 5: Solve for x
    x = 3,971.80/56.35
  6. Step 6: Final answer
    x = 70.48

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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.