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Finding the Fourth Proportional to 869.80, 1,305.62 and 523.98

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Solution

The fourth proportional to 869.80, 1,305.62 and 523.98 is: 786.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.80 : 1,305.62 = 523.98 : x
  2. Step 2: Convert to fraction form
    869.80/1,305.62 = 523.98/x
  3. Step 3: Cross multiply
    869.80x = 1,305.62 × 523.98
  4. Step 4: Simplify right side
    869.80x = 684,118.77
  5. Step 5: Solve for x
    x = 684,118.77/869.80
  6. Step 6: Final answer
    x = 786.52

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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.