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Finding the Fourth Proportional to 801.30, 1,206.20 and 571.78

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Solution

The fourth proportional to 801.30, 1,206.20 and 571.78 is: 860.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.30 : 1,206.20 = 571.78 : x
  2. Step 2: Convert to fraction form
    801.30/1,206.20 = 571.78/x
  3. Step 3: Cross multiply
    801.30x = 1,206.20 × 571.78
  4. Step 4: Simplify right side
    801.30x = 689,675.01
  5. Step 5: Solve for x
    x = 689,675.01/801.30
  6. Step 6: Final answer
    x = 860.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.