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Finding the Fourth Proportional to 784.89, 1,082.57 and 469.80

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Solution

The fourth proportional to 784.89, 1,082.57 and 469.80 is: 647.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.89 : 1,082.57 = 469.80 : x
  2. Step 2: Convert to fraction form
    784.89/1,082.57 = 469.80/x
  3. Step 3: Cross multiply
    784.89x = 1,082.57 × 469.80
  4. Step 4: Simplify right side
    784.89x = 508,589.04
  5. Step 5: Solve for x
    x = 508,589.04/784.89
  6. Step 6: Final answer
    x = 647.97

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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.