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Finding the Fourth Proportional to 784.75, 1,181.71 and 580.75

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Solution

The fourth proportional to 784.75, 1,181.71 and 580.75 is: 874.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.75 : 1,181.71 = 580.75 : x
  2. Step 2: Convert to fraction form
    784.75/1,181.71 = 580.75/x
  3. Step 3: Cross multiply
    784.75x = 1,181.71 × 580.75
  4. Step 4: Simplify right side
    784.75x = 686,278.08
  5. Step 5: Solve for x
    x = 686,278.08/784.75
  6. Step 6: Final answer
    x = 874.52

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.