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Finding the Fourth Proportional to 208.78, 313.12 and 99.04

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Solution

The fourth proportional to 208.78, 313.12 and 99.04 is: 148.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.78 : 313.12 = 99.04 : x
  2. Step 2: Convert to fraction form
    208.78/313.12 = 99.04/x
  3. Step 3: Cross multiply
    208.78x = 313.12 × 99.04
  4. Step 4: Simplify right side
    208.78x = 31,011.40
  5. Step 5: Solve for x
    x = 31,011.40/208.78
  6. Step 6: Final answer
    x = 148.54

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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.