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Finding the Fourth Proportional to 1,205.96, 1,664.42 and 1,009.40

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Solution

The fourth proportional to 1,205.96, 1,664.42 and 1,009.40 is: 1,393.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.96 : 1,664.42 = 1,009.40 : x
  2. Step 2: Convert to fraction form
    1,205.96/1,664.42 = 1,009.40/x
  3. Step 3: Cross multiply
    1,205.96x = 1,664.42 × 1,009.40
  4. Step 4: Simplify right side
    1,205.96x = 1,680,052.18
  5. Step 5: Solve for x
    x = 1,680,052.18/1,205.96
  6. Step 6: Final answer
    x = 1,393.13

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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.