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Finding the Fourth Proportional to 858.70, 1,287.79 and 447.62

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Solution

The fourth proportional to 858.70, 1,287.79 and 447.62 is: 671.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.70 : 1,287.79 = 447.62 : x
  2. Step 2: Convert to fraction form
    858.70/1,287.79 = 447.62/x
  3. Step 3: Cross multiply
    858.70x = 1,287.79 × 447.62
  4. Step 4: Simplify right side
    858.70x = 576,440.56
  5. Step 5: Solve for x
    x = 576,440.56/858.70
  6. Step 6: Final answer
    x = 671.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.