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Finding the Fourth Proportional to 691.05, 953.85 and 455.17

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Solution

The fourth proportional to 691.05, 953.85 and 455.17 is: 628.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.05 : 953.85 = 455.17 : x
  2. Step 2: Convert to fraction form
    691.05/953.85 = 455.17/x
  3. Step 3: Cross multiply
    691.05x = 953.85 × 455.17
  4. Step 4: Simplify right side
    691.05x = 434,161.63
  5. Step 5: Solve for x
    x = 434,161.63/691.05
  6. Step 6: Final answer
    x = 628.26

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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.