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Finding the Fourth Proportional to 579.98, 870.38 and 426.31

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Solution

The fourth proportional to 579.98, 870.38 and 426.31 is: 639.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.98 : 870.38 = 426.31 : x
  2. Step 2: Convert to fraction form
    579.98/870.38 = 426.31/x
  3. Step 3: Cross multiply
    579.98x = 870.38 × 426.31
  4. Step 4: Simplify right side
    579.98x = 371,051.70
  5. Step 5: Solve for x
    x = 371,051.70/579.98
  6. Step 6: Final answer
    x = 639.77

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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.