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Finding the Fourth Proportional to 691.95, 955.00 and 412.21

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Solution

The fourth proportional to 691.95, 955.00 and 412.21 is: 568.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.95 : 955.00 = 412.21 : x
  2. Step 2: Convert to fraction form
    691.95/955.00 = 412.21/x
  3. Step 3: Cross multiply
    691.95x = 955.00 × 412.21
  4. Step 4: Simplify right side
    691.95x = 393,658.49
  5. Step 5: Solve for x
    x = 393,658.49/691.95
  6. Step 6: Final answer
    x = 568.91

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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.