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Finding the Fourth Proportional to 1,228.08, 1,693.44 and 785.28

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Solution

The fourth proportional to 1,228.08, 1,693.44 and 785.28 is: 1,082.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.08 : 1,693.44 = 785.28 : x
  2. Step 2: Convert to fraction form
    1,228.08/1,693.44 = 785.28/x
  3. Step 3: Cross multiply
    1,228.08x = 1,693.44 × 785.28
  4. Step 4: Simplify right side
    1,228.08x = 1,329,824.56
  5. Step 5: Solve for x
    x = 1,329,824.56/1,228.08
  6. Step 6: Final answer
    x = 1,082.85

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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.