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Finding the Fourth Proportional to 472.95, 709.12 and 198.90

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Solution

The fourth proportional to 472.95, 709.12 and 198.90 is: 298.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.95 : 709.12 = 198.90 : x
  2. Step 2: Convert to fraction form
    472.95/709.12 = 198.90/x
  3. Step 3: Cross multiply
    472.95x = 709.12 × 198.90
  4. Step 4: Simplify right side
    472.95x = 141,044.22
  5. Step 5: Solve for x
    x = 141,044.22/472.95
  6. Step 6: Final answer
    x = 298.22

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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.