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Finding the Fourth Proportional to 1,379.68, 2,069.76 and 514.24

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Solution

The fourth proportional to 1,379.68, 2,069.76 and 514.24 is: 771.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.68 : 2,069.76 = 514.24 : x
  2. Step 2: Convert to fraction form
    1,379.68/2,069.76 = 514.24/x
  3. Step 3: Cross multiply
    1,379.68x = 2,069.76 × 514.24
  4. Step 4: Simplify right side
    1,379.68x = 1,064,353.38
  5. Step 5: Solve for x
    x = 1,064,353.38/1,379.68
  6. Step 6: Final answer
    x = 771.45

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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.