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Finding the Fourth Proportional to 2,914.40, 4,020 and 1,672.40

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Solution

The fourth proportional to 2,914.40, 4,020 and 1,672.40 is: 2,306.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,914.40 : 4,020 = 1,672.40 : x
  2. Step 2: Convert to fraction form
    2,914.40/4,020 = 1,672.40/x
  3. Step 3: Cross multiply
    2,914.40x = 4,020 × 1,672.40
  4. Step 4: Simplify right side
    2,914.40x = 6,723,048
  5. Step 5: Solve for x
    x = 6,723,048/2,914.40
  6. Step 6: Final answer
    x = 2,306.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.