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Finding the Fourth Proportional to 859.08, 1,288.58 and 425.90

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Solution

The fourth proportional to 859.08, 1,288.58 and 425.90 is: 638.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.08 : 1,288.58 = 425.90 : x
  2. Step 2: Convert to fraction form
    859.08/1,288.58 = 425.90/x
  3. Step 3: Cross multiply
    859.08x = 1,288.58 × 425.90
  4. Step 4: Simplify right side
    859.08x = 548,806.22
  5. Step 5: Solve for x
    x = 548,806.22/859.08
  6. Step 6: Final answer
    x = 638.83

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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.