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Finding the Fourth Proportional to 784.20, 1,176.60 and 540.12

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Solution

The fourth proportional to 784.20, 1,176.60 and 540.12 is: 810.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.20 : 1,176.60 = 540.12 : x
  2. Step 2: Convert to fraction form
    784.20/1,176.60 = 540.12/x
  3. Step 3: Cross multiply
    784.20x = 1,176.60 × 540.12
  4. Step 4: Simplify right side
    784.20x = 635,505.19
  5. Step 5: Solve for x
    x = 635,505.19/784.20
  6. Step 6: Final answer
    x = 810.39

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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.