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Finding the Fourth Proportional to 868.48, 1,303.44 and 687.76

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Solution

The fourth proportional to 868.48, 1,303.44 and 687.76 is: 1,032.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.48 : 1,303.44 = 687.76 : x
  2. Step 2: Convert to fraction form
    868.48/1,303.44 = 687.76/x
  3. Step 3: Cross multiply
    868.48x = 1,303.44 × 687.76
  4. Step 4: Simplify right side
    868.48x = 896,453.89
  5. Step 5: Solve for x
    x = 896,453.89/868.48
  6. Step 6: Final answer
    x = 1,032.21

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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.