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Finding the Fourth Proportional to 262.07, 393.16 and 117.78

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Solution

The fourth proportional to 262.07, 393.16 and 117.78 is: 176.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.07 : 393.16 = 117.78 : x
  2. Step 2: Convert to fraction form
    262.07/393.16 = 117.78/x
  3. Step 3: Cross multiply
    262.07x = 393.16 × 117.78
  4. Step 4: Simplify right side
    262.07x = 46,306.38
  5. Step 5: Solve for x
    x = 46,306.38/262.07
  6. Step 6: Final answer
    x = 176.70

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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.