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Finding the Fourth Proportional to 1,221.60, 1,685.79 and 697.53

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Solution

The fourth proportional to 1,221.60, 1,685.79 and 697.53 is: 962.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.60 : 1,685.79 = 697.53 : x
  2. Step 2: Convert to fraction form
    1,221.60/1,685.79 = 697.53/x
  3. Step 3: Cross multiply
    1,221.60x = 1,685.79 × 697.53
  4. Step 4: Simplify right side
    1,221.60x = 1,175,889.10
  5. Step 5: Solve for x
    x = 1,175,889.10/1,221.60
  6. Step 6: Final answer
    x = 962.58

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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.