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Finding the Fourth Proportional to 868.56, 1,303.02 and 665.70

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Solution

The fourth proportional to 868.56, 1,303.02 and 665.70 is: 998.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.56 : 1,303.02 = 665.70 : x
  2. Step 2: Convert to fraction form
    868.56/1,303.02 = 665.70/x
  3. Step 3: Cross multiply
    868.56x = 1,303.02 × 665.70
  4. Step 4: Simplify right side
    868.56x = 867,420.41
  5. Step 5: Solve for x
    x = 867,420.41/868.56
  6. Step 6: Final answer
    x = 998.69

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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.