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Finding the Fourth Proportional to 1,221.54, 1,685.72 and 662.01

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Solution

The fourth proportional to 1,221.54, 1,685.72 and 662.01 is: 913.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.54 : 1,685.72 = 662.01 : x
  2. Step 2: Convert to fraction form
    1,221.54/1,685.72 = 662.01/x
  3. Step 3: Cross multiply
    1,221.54x = 1,685.72 × 662.01
  4. Step 4: Simplify right side
    1,221.54x = 1,115,963.50
  5. Step 5: Solve for x
    x = 1,115,963.50/1,221.54
  6. Step 6: Final answer
    x = 913.57

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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.