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Finding the Fourth Proportional to 127.65, 176.15 and 78.52

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Solution

The fourth proportional to 127.65, 176.15 and 78.52 is: 108.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.65 : 176.15 = 78.52 : x
  2. Step 2: Convert to fraction form
    127.65/176.15 = 78.52/x
  3. Step 3: Cross multiply
    127.65x = 176.15 × 78.52
  4. Step 4: Simplify right side
    127.65x = 13,831.30
  5. Step 5: Solve for x
    x = 13,831.30/127.65
  6. Step 6: Final answer
    x = 108.35

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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.