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Finding the Fourth Proportional to 1,230.57, 1,698.08 and 699.45

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Solution

The fourth proportional to 1,230.57, 1,698.08 and 699.45 is: 965.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.57 : 1,698.08 = 699.45 : x
  2. Step 2: Convert to fraction form
    1,230.57/1,698.08 = 699.45/x
  3. Step 3: Cross multiply
    1,230.57x = 1,698.08 × 699.45
  4. Step 4: Simplify right side
    1,230.57x = 1,187,718.56
  5. Step 5: Solve for x
    x = 1,187,718.56/1,230.57
  6. Step 6: Final answer
    x = 965.18

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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.