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Finding the Fourth Proportional to 868.92, 1,303.50 and 478.78

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Solution

The fourth proportional to 868.92, 1,303.50 and 478.78 is: 718.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.92 : 1,303.50 = 478.78 : x
  2. Step 2: Convert to fraction form
    868.92/1,303.50 = 478.78/x
  3. Step 3: Cross multiply
    868.92x = 1,303.50 × 478.78
  4. Step 4: Simplify right side
    868.92x = 624,089.73
  5. Step 5: Solve for x
    x = 624,089.73/868.92
  6. Step 6: Final answer
    x = 718.24

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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.