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Finding the Fourth Proportional to 784.76, 1,082.04 and 644.43

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Solution

The fourth proportional to 784.76, 1,082.04 and 644.43 is: 888.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.76 : 1,082.04 = 644.43 : x
  2. Step 2: Convert to fraction form
    784.76/1,082.04 = 644.43/x
  3. Step 3: Cross multiply
    784.76x = 1,082.04 × 644.43
  4. Step 4: Simplify right side
    784.76x = 697,298.22
  5. Step 5: Solve for x
    x = 697,298.22/784.76
  6. Step 6: Final answer
    x = 888.55

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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.