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Finding the Fourth Proportional to 691.10, 953.69 and 396.39

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Solution

The fourth proportional to 691.10, 953.69 and 396.39 is: 547.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.10 : 953.69 = 396.39 : x
  2. Step 2: Convert to fraction form
    691.10/953.69 = 396.39/x
  3. Step 3: Cross multiply
    691.10x = 953.69 × 396.39
  4. Step 4: Simplify right side
    691.10x = 378,031.20
  5. Step 5: Solve for x
    x = 378,031.20/691.10
  6. Step 6: Final answer
    x = 547.00

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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.