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Finding the Fourth Proportional to 691.99, 954.98 and 397.36

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Solution

The fourth proportional to 691.99, 954.98 and 397.36 is: 548.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.99 : 954.98 = 397.36 : x
  2. Step 2: Convert to fraction form
    691.99/954.98 = 397.36/x
  3. Step 3: Cross multiply
    691.99x = 954.98 × 397.36
  4. Step 4: Simplify right side
    691.99x = 379,470.85
  5. Step 5: Solve for x
    x = 379,470.85/691.99
  6. Step 6: Final answer
    x = 548.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.