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Finding the Fourth Proportional to 117, 175.14 and 71.28

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Solution

The fourth proportional to 117, 175.14 and 71.28 is: 106.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    117 : 175.14 = 71.28 : x
  2. Step 2: Convert to fraction form
    117/175.14 = 71.28/x
  3. Step 3: Cross multiply
    117x = 175.14 × 71.28
  4. Step 4: Simplify right side
    117x = 12,483.98
  5. Step 5: Solve for x
    x = 12,483.98/117
  6. Step 6: Final answer
    x = 106.70

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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.