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Finding the Fourth Proportional to 691.85, 953.66 and 455.42

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Solution

The fourth proportional to 691.85, 953.66 and 455.42 is: 627.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.85 : 953.66 = 455.42 : x
  2. Step 2: Convert to fraction form
    691.85/953.66 = 455.42/x
  3. Step 3: Cross multiply
    691.85x = 953.66 × 455.42
  4. Step 4: Simplify right side
    691.85x = 434,312.21
  5. Step 5: Solve for x
    x = 434,312.21/691.85
  6. Step 6: Final answer
    x = 627.76

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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.