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Finding the Fourth Proportional to 1,397.40, 2,095.20 and 668.04

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Solution

The fourth proportional to 1,397.40, 2,095.20 and 668.04 is: 1,001.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.40 : 2,095.20 = 668.04 : x
  2. Step 2: Convert to fraction form
    1,397.40/2,095.20 = 668.04/x
  3. Step 3: Cross multiply
    1,397.40x = 2,095.20 × 668.04
  4. Step 4: Simplify right side
    1,397.40x = 1,399,677.41
  5. Step 5: Solve for x
    x = 1,399,677.41/1,397.40
  6. Step 6: Final answer
    x = 1,001.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.