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Finding the Fourth Proportional to 1,398.63, 2,097.95 and 781.41

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Solution

The fourth proportional to 1,398.63, 2,097.95 and 781.41 is: 1,172.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.63 : 2,097.95 = 781.41 : x
  2. Step 2: Convert to fraction form
    1,398.63/2,097.95 = 781.41/x
  3. Step 3: Cross multiply
    1,398.63x = 2,097.95 × 781.41
  4. Step 4: Simplify right side
    1,398.63x = 1,639,355.20
  5. Step 5: Solve for x
    x = 1,639,355.20/1,398.63
  6. Step 6: Final answer
    x = 1,172.12

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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.