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Finding the Fourth Proportional to 1,221.28, 1,685.18 and 697.20

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Solution

The fourth proportional to 1,221.28, 1,685.18 and 697.20 is: 962.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.28 : 1,685.18 = 697.20 : x
  2. Step 2: Convert to fraction form
    1,221.28/1,685.18 = 697.20/x
  3. Step 3: Cross multiply
    1,221.28x = 1,685.18 × 697.20
  4. Step 4: Simplify right side
    1,221.28x = 1,174,907.50
  5. Step 5: Solve for x
    x = 1,174,907.50/1,221.28
  6. Step 6: Final answer
    x = 962.03

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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.