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Finding the Fourth Proportional to 868.55, 1,303.85 and 686.07

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Solution

The fourth proportional to 868.55, 1,303.85 and 686.07 is: 1,029.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.55 : 1,303.85 = 686.07 : x
  2. Step 2: Convert to fraction form
    868.55/1,303.85 = 686.07/x
  3. Step 3: Cross multiply
    868.55x = 1,303.85 × 686.07
  4. Step 4: Simplify right side
    868.55x = 894,532.37
  5. Step 5: Solve for x
    x = 894,532.37/868.55
  6. Step 6: Final answer
    x = 1,029.91

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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.