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Finding the Fourth Proportional to 857.94, 1,287.57 and 447.18

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Solution

The fourth proportional to 857.94, 1,287.57 and 447.18 is: 671.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.94 : 1,287.57 = 447.18 : x
  2. Step 2: Convert to fraction form
    857.94/1,287.57 = 447.18/x
  3. Step 3: Cross multiply
    857.94x = 1,287.57 × 447.18
  4. Step 4: Simplify right side
    857.94x = 575,775.55
  5. Step 5: Solve for x
    x = 575,775.55/857.94
  6. Step 6: Final answer
    x = 671.11

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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.