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Finding the Fourth Proportional to 862.80, 1,190.66 and 469.83

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Solution

The fourth proportional to 862.80, 1,190.66 and 469.83 is: 648.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.80 : 1,190.66 = 469.83 : x
  2. Step 2: Convert to fraction form
    862.80/1,190.66 = 469.83/x
  3. Step 3: Cross multiply
    862.80x = 1,190.66 × 469.83
  4. Step 4: Simplify right side
    862.80x = 559,407.79
  5. Step 5: Solve for x
    x = 559,407.79/862.80
  6. Step 6: Final answer
    x = 648.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.