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Finding the Fourth Proportional to 1,245.19, 1,866.30 and 514.57

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Solution

The fourth proportional to 1,245.19, 1,866.30 and 514.57 is: 771.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.19 : 1,866.30 = 514.57 : x
  2. Step 2: Convert to fraction form
    1,245.19/1,866.30 = 514.57/x
  3. Step 3: Cross multiply
    1,245.19x = 1,866.30 × 514.57
  4. Step 4: Simplify right side
    1,245.19x = 960,341.99
  5. Step 5: Solve for x
    x = 960,341.99/1,245.19
  6. Step 6: Final answer
    x = 771.24

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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.