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Finding the Fourth Proportional to 691.80, 955.17 and 443.76

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Solution

The fourth proportional to 691.80, 955.17 and 443.76 is: 612.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.80 : 955.17 = 443.76 : x
  2. Step 2: Convert to fraction form
    691.80/955.17 = 443.76/x
  3. Step 3: Cross multiply
    691.80x = 955.17 × 443.76
  4. Step 4: Simplify right side
    691.80x = 423,866.24
  5. Step 5: Solve for x
    x = 423,866.24/691.80
  6. Step 6: Final answer
    x = 612.70

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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.