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Finding the Fourth Proportional to 859.02, 1,288.71 and 426.12

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Solution

The fourth proportional to 859.02, 1,288.71 and 426.12 is: 639.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.02 : 1,288.71 = 426.12 : x
  2. Step 2: Convert to fraction form
    859.02/1,288.71 = 426.12/x
  3. Step 3: Cross multiply
    859.02x = 1,288.71 × 426.12
  4. Step 4: Simplify right side
    859.02x = 549,145.11
  5. Step 5: Solve for x
    x = 549,145.11/859.02
  6. Step 6: Final answer
    x = 639.27

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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.