Home / 1,221.13-1,685.10-697.06

Finding the Fourth Proportional to 1,221.13, 1,685.10 and 697.06

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Solution

The fourth proportional to 1,221.13, 1,685.10 and 697.06 is: 961.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.13 : 1,685.10 = 697.06 : x
  2. Step 2: Convert to fraction form
    1,221.13/1,685.10 = 697.06/x
  3. Step 3: Cross multiply
    1,221.13x = 1,685.10 × 697.06
  4. Step 4: Simplify right side
    1,221.13x = 1,174,615.81
  5. Step 5: Solve for x
    x = 1,174,615.81/1,221.13
  6. Step 6: Final answer
    x = 961.91

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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.