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Finding the Fourth Proportional to 784.67, 1,080.38 and 666.41

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Solution

The fourth proportional to 784.67, 1,080.38 and 666.41 is: 917.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.67 : 1,080.38 = 666.41 : x
  2. Step 2: Convert to fraction form
    784.67/1,080.38 = 666.41/x
  3. Step 3: Cross multiply
    784.67x = 1,080.38 × 666.41
  4. Step 4: Simplify right side
    784.67x = 719,972.30
  5. Step 5: Solve for x
    x = 719,972.30/784.67
  6. Step 6: Final answer
    x = 917.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.