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Finding the Fourth Proportional to 858.55, 1,288.23 and 426.01

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Solution

The fourth proportional to 858.55, 1,288.23 and 426.01 is: 639.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.55 : 1,288.23 = 426.01 : x
  2. Step 2: Convert to fraction form
    858.55/1,288.23 = 426.01/x
  3. Step 3: Cross multiply
    858.55x = 1,288.23 × 426.01
  4. Step 4: Simplify right side
    858.55x = 548,798.86
  5. Step 5: Solve for x
    x = 548,798.86/858.55
  6. Step 6: Final answer
    x = 639.22

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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.