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Finding the Fourth Proportional to 315.18, 472.78 and 98.75

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Solution

The fourth proportional to 315.18, 472.78 and 98.75 is: 148.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.18 : 472.78 = 98.75 : x
  2. Step 2: Convert to fraction form
    315.18/472.78 = 98.75/x
  3. Step 3: Cross multiply
    315.18x = 472.78 × 98.75
  4. Step 4: Simplify right side
    315.18x = 46,687.03
  5. Step 5: Solve for x
    x = 46,687.03/315.18
  6. Step 6: Final answer
    x = 148.13

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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.