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Finding the Fourth Proportional to 691.92, 954.88 and 443.36

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Solution

The fourth proportional to 691.92, 954.88 and 443.36 is: 611.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.92 : 954.88 = 443.36 : x
  2. Step 2: Convert to fraction form
    691.92/954.88 = 443.36/x
  3. Step 3: Cross multiply
    691.92x = 954.88 × 443.36
  4. Step 4: Simplify right side
    691.92x = 423,355.60
  5. Step 5: Solve for x
    x = 423,355.60/691.92
  6. Step 6: Final answer
    x = 611.86

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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.