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Finding the Fourth Proportional to 117.90, 176 and 103.50

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Solution

The fourth proportional to 117.90, 176 and 103.50 is: 154.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.90 : 176 = 103.50 : x
  2. Step 2: Convert to fraction form
    117.90/176 = 103.50/x
  3. Step 3: Cross multiply
    117.90x = 176 × 103.50
  4. Step 4: Simplify right side
    117.90x = 18,216
  5. Step 5: Solve for x
    x = 18,216/117.90
  6. Step 6: Final answer
    x = 154.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.