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Finding the Fourth Proportional to 691.07, 953.90 and 443.06

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Solution

The fourth proportional to 691.07, 953.90 and 443.06 is: 611.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.07 : 953.90 = 443.06 : x
  2. Step 2: Convert to fraction form
    691.07/953.90 = 443.06/x
  3. Step 3: Cross multiply
    691.07x = 953.90 × 443.06
  4. Step 4: Simplify right side
    691.07x = 422,634.93
  5. Step 5: Solve for x
    x = 422,634.93/691.07
  6. Step 6: Final answer
    x = 611.57

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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.