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Finding the Fourth Proportional to 1,409.80, 2,113.48 and 679.89

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Solution

The fourth proportional to 1,409.80, 2,113.48 and 679.89 is: 1,019.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.80 : 2,113.48 = 679.89 : x
  2. Step 2: Convert to fraction form
    1,409.80/2,113.48 = 679.89/x
  3. Step 3: Cross multiply
    1,409.80x = 2,113.48 × 679.89
  4. Step 4: Simplify right side
    1,409.80x = 1,436,926.84
  5. Step 5: Solve for x
    x = 1,436,926.84/1,409.80
  6. Step 6: Final answer
    x = 1,019.24

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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.