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Finding the Fourth Proportional to 117.78, 176.71 and 56.90

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Solution

The fourth proportional to 117.78, 176.71 and 56.90 is: 85.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.78 : 176.71 = 56.90 : x
  2. Step 2: Convert to fraction form
    117.78/176.71 = 56.90/x
  3. Step 3: Cross multiply
    117.78x = 176.71 × 56.90
  4. Step 4: Simplify right side
    117.78x = 10,055.05
  5. Step 5: Solve for x
    x = 10,055.05/117.78
  6. Step 6: Final answer
    x = 85.37

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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.