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Finding the Fourth Proportional to 117.40, 176.31 and 103.50

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Solution

The fourth proportional to 117.40, 176.31 and 103.50 is: 155.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.40 : 176.31 = 103.50 : x
  2. Step 2: Convert to fraction form
    117.40/176.31 = 103.50/x
  3. Step 3: Cross multiply
    117.40x = 176.31 × 103.50
  4. Step 4: Simplify right side
    117.40x = 18,248.09
  5. Step 5: Solve for x
    x = 18,248.09/117.40
  6. Step 6: Final answer
    x = 155.44

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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.