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Finding the Fourth Proportional to 1,228.77, 1,693.10 and 979.70

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Solution

The fourth proportional to 1,228.77, 1,693.10 and 979.70 is: 1,349.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.77 : 1,693.10 = 979.70 : x
  2. Step 2: Convert to fraction form
    1,228.77/1,693.10 = 979.70/x
  3. Step 3: Cross multiply
    1,228.77x = 1,693.10 × 979.70
  4. Step 4: Simplify right side
    1,228.77x = 1,658,724.05
  5. Step 5: Solve for x
    x = 1,658,724.05/1,228.77
  6. Step 6: Final answer
    x = 1,349.91

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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.