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Finding the Fourth Proportional to 1,693.84, 2,335.26 and 1,221.34

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Solution

The fourth proportional to 1,693.84, 2,335.26 and 1,221.34 is: 1,683.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,693.84 : 2,335.26 = 1,221.34 : x
  2. Step 2: Convert to fraction form
    1,693.84/2,335.26 = 1,221.34/x
  3. Step 3: Cross multiply
    1,693.84x = 2,335.26 × 1,221.34
  4. Step 4: Simplify right side
    1,693.84x = 2,852,146.45
  5. Step 5: Solve for x
    x = 2,852,146.45/1,693.84
  6. Step 6: Final answer
    x = 1,683.83

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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.