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Finding the Fourth Proportional to 127.77, 176.35 and 78.69

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Solution

The fourth proportional to 127.77, 176.35 and 78.69 is: 108.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.77 : 176.35 = 78.69 : x
  2. Step 2: Convert to fraction form
    127.77/176.35 = 78.69/x
  3. Step 3: Cross multiply
    127.77x = 176.35 × 78.69
  4. Step 4: Simplify right side
    127.77x = 13,875.71
  5. Step 5: Solve for x
    x = 13,875.71/127.77
  6. Step 6: Final answer
    x = 108.60

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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.