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Finding the Fourth Proportional to 869.93, 1,305.07 and 782.79

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Solution

The fourth proportional to 869.93, 1,305.07 and 782.79 is: 1,174.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.93 : 1,305.07 = 782.79 : x
  2. Step 2: Convert to fraction form
    869.93/1,305.07 = 782.79/x
  3. Step 3: Cross multiply
    869.93x = 1,305.07 × 782.79
  4. Step 4: Simplify right side
    869.93x = 1,021,596.24
  5. Step 5: Solve for x
    x = 1,021,596.24/869.93
  6. Step 6: Final answer
    x = 1,174.34

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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.