Home / 1,223.18-1,688.19-699.50

Finding the Fourth Proportional to 1,223.18, 1,688.19 and 699.50

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Solution

The fourth proportional to 1,223.18, 1,688.19 and 699.50 is: 965.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.18 : 1,688.19 = 699.50 : x
  2. Step 2: Convert to fraction form
    1,223.18/1,688.19 = 699.50/x
  3. Step 3: Cross multiply
    1,223.18x = 1,688.19 × 699.50
  4. Step 4: Simplify right side
    1,223.18x = 1,180,888.91
  5. Step 5: Solve for x
    x = 1,180,888.91/1,223.18
  6. Step 6: Final answer
    x = 965.43

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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.