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Finding the Fourth Proportional to 56.91, 78.63 and 51.48

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Solution

The fourth proportional to 56.91, 78.63 and 51.48 is: 71.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.91 : 78.63 = 51.48 : x
  2. Step 2: Convert to fraction form
    56.91/78.63 = 51.48/x
  3. Step 3: Cross multiply
    56.91x = 78.63 × 51.48
  4. Step 4: Simplify right side
    56.91x = 4,047.87
  5. Step 5: Solve for x
    x = 4,047.87/56.91
  6. Step 6: Final answer
    x = 71.13

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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.