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Finding the Fourth Proportional to 1,379.90, 2,069.22 and 502.40

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Solution

The fourth proportional to 1,379.90, 2,069.22 and 502.40 is: 753.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.90 : 2,069.22 = 502.40 : x
  2. Step 2: Convert to fraction form
    1,379.90/2,069.22 = 502.40/x
  3. Step 3: Cross multiply
    1,379.90x = 2,069.22 × 502.40
  4. Step 4: Simplify right side
    1,379.90x = 1,039,576.13
  5. Step 5: Solve for x
    x = 1,039,576.13/1,379.90
  6. Step 6: Final answer
    x = 753.37

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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.