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Finding the Fourth Proportional to 1,411.71, 2,118.93 and 681.80

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Solution

The fourth proportional to 1,411.71, 2,118.93 and 681.80 is: 1,023.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,411.71 : 2,118.93 = 681.80 : x
  2. Step 2: Convert to fraction form
    1,411.71/2,118.93 = 681.80/x
  3. Step 3: Cross multiply
    1,411.71x = 2,118.93 × 681.80
  4. Step 4: Simplify right side
    1,411.71x = 1,444,686.47
  5. Step 5: Solve for x
    x = 1,444,686.47/1,411.71
  6. Step 6: Final answer
    x = 1,023.36

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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.