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Finding the Fourth Proportional to 1,221.02, 1,685 and 697.05

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Solution

The fourth proportional to 1,221.02, 1,685 and 697.05 is: 961.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.02 : 1,685 = 697.05 : x
  2. Step 2: Convert to fraction form
    1,221.02/1,685 = 697.05/x
  3. Step 3: Cross multiply
    1,221.02x = 1,685 × 697.05
  4. Step 4: Simplify right side
    1,221.02x = 1,174,529.25
  5. Step 5: Solve for x
    x = 1,174,529.25/1,221.02
  6. Step 6: Final answer
    x = 961.92

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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.