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Finding the Fourth Proportional to 859.42, 1,287.87 and 425.71

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Solution

The fourth proportional to 859.42, 1,287.87 and 425.71 is: 637.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.42 : 1,287.87 = 425.71 : x
  2. Step 2: Convert to fraction form
    859.42/1,287.87 = 425.71/x
  3. Step 3: Cross multiply
    859.42x = 1,287.87 × 425.71
  4. Step 4: Simplify right side
    859.42x = 548,259.14
  5. Step 5: Solve for x
    x = 548,259.14/859.42
  6. Step 6: Final answer
    x = 637.94

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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.