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Finding the Fourth Proportional to 1,228.46, 1,695.20 and 786.47

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Solution

The fourth proportional to 1,228.46, 1,695.20 and 786.47 is: 1,085.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.46 : 1,695.20 = 786.47 : x
  2. Step 2: Convert to fraction form
    1,228.46/1,695.20 = 786.47/x
  3. Step 3: Cross multiply
    1,228.46x = 1,695.20 × 786.47
  4. Step 4: Simplify right side
    1,228.46x = 1,333,211.54
  5. Step 5: Solve for x
    x = 1,333,211.54/1,228.46
  6. Step 6: Final answer
    x = 1,085.28

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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.