Home / 1,221.14-1,685.16-697.18

Finding the Fourth Proportional to 1,221.14, 1,685.16 and 697.18

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Solution

The fourth proportional to 1,221.14, 1,685.16 and 697.18 is: 962.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.14 : 1,685.16 = 697.18 : x
  2. Step 2: Convert to fraction form
    1,221.14/1,685.16 = 697.18/x
  3. Step 3: Cross multiply
    1,221.14x = 1,685.16 × 697.18
  4. Step 4: Simplify right side
    1,221.14x = 1,174,859.85
  5. Step 5: Solve for x
    x = 1,174,859.85/1,221.14
  6. Step 6: Final answer
    x = 962.10

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1.5x scale

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.