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Finding the Fourth Proportional to 783.30, 1,082.88 and 775.92

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Solution

The fourth proportional to 783.30, 1,082.88 and 775.92 is: 1,072.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.30 : 1,082.88 = 775.92 : x
  2. Step 2: Convert to fraction form
    783.30/1,082.88 = 775.92/x
  3. Step 3: Cross multiply
    783.30x = 1,082.88 × 775.92
  4. Step 4: Simplify right side
    783.30x = 840,228.25
  5. Step 5: Solve for x
    x = 840,228.25/783.30
  6. Step 6: Final answer
    x = 1,072.68

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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.