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Finding the Fourth Proportional to 208.84, 312.72 and 117.40

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Solution

The fourth proportional to 208.84, 312.72 and 117.40 is: 175.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.84 : 312.72 = 117.40 : x
  2. Step 2: Convert to fraction form
    208.84/312.72 = 117.40/x
  3. Step 3: Cross multiply
    208.84x = 312.72 × 117.40
  4. Step 4: Simplify right side
    208.84x = 36,713.33
  5. Step 5: Solve for x
    x = 36,713.33/208.84
  6. Step 6: Final answer
    x = 175.80

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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.