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Finding the Fourth Proportional to 315.21, 472.88 and 98.79

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Solution

The fourth proportional to 315.21, 472.88 and 98.79 is: 148.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.21 : 472.88 = 98.79 : x
  2. Step 2: Convert to fraction form
    315.21/472.88 = 98.79/x
  3. Step 3: Cross multiply
    315.21x = 472.88 × 98.79
  4. Step 4: Simplify right side
    315.21x = 46,715.82
  5. Step 5: Solve for x
    x = 46,715.82/315.21
  6. Step 6: Final answer
    x = 148.21

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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.