Home / 1,288.18-1,777.70-698.72

Finding the Fourth Proportional to 1,288.18, 1,777.70 and 698.72

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Solution

The fourth proportional to 1,288.18, 1,777.70 and 698.72 is: 964.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.18 : 1,777.70 = 698.72 : x
  2. Step 2: Convert to fraction form
    1,288.18/1,777.70 = 698.72/x
  3. Step 3: Cross multiply
    1,288.18x = 1,777.70 × 698.72
  4. Step 4: Simplify right side
    1,288.18x = 1,242,102.16
  5. Step 5: Solve for x
    x = 1,242,102.16/1,288.18
  6. Step 6: Final answer
    x = 964.23

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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.