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Finding the Fourth Proportional to 1,681.68, 2,520 and 1,314.84

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Solution

The fourth proportional to 1,681.68, 2,520 and 1,314.84 is: 1,970.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.68 : 2,520 = 1,314.84 : x
  2. Step 2: Convert to fraction form
    1,681.68/2,520 = 1,314.84/x
  3. Step 3: Cross multiply
    1,681.68x = 2,520 × 1,314.84
  4. Step 4: Simplify right side
    1,681.68x = 3,313,396.80
  5. Step 5: Solve for x
    x = 3,313,396.80/1,681.68
  6. Step 6: Final answer
    x = 1,970.29

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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.