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Finding the Fourth Proportional to 911.28, 1,365.80 and 478.16

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Solution

The fourth proportional to 911.28, 1,365.80 and 478.16 is: 716.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.28 : 1,365.80 = 478.16 : x
  2. Step 2: Convert to fraction form
    911.28/1,365.80 = 478.16/x
  3. Step 3: Cross multiply
    911.28x = 1,365.80 × 478.16
  4. Step 4: Simplify right side
    911.28x = 653,070.93
  5. Step 5: Solve for x
    x = 653,070.93/911.28
  6. Step 6: Final answer
    x = 716.65

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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.