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Finding the Fourth Proportional to 911.04, 1,366.80 and 478.08

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Solution

The fourth proportional to 911.04, 1,366.80 and 478.08 is: 717.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.04 : 1,366.80 = 478.08 : x
  2. Step 2: Convert to fraction form
    911.04/1,366.80 = 478.08/x
  3. Step 3: Cross multiply
    911.04x = 1,366.80 × 478.08
  4. Step 4: Simplify right side
    911.04x = 653,439.74
  5. Step 5: Solve for x
    x = 653,439.74/911.04
  6. Step 6: Final answer
    x = 717.25

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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.