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Finding the Fourth Proportional to 1,245.40, 1,868.06 and 514.76

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Solution

The fourth proportional to 1,245.40, 1,868.06 and 514.76 is: 772.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.40 : 1,868.06 = 514.76 : x
  2. Step 2: Convert to fraction form
    1,245.40/1,868.06 = 514.76/x
  3. Step 3: Cross multiply
    1,245.40x = 1,868.06 × 514.76
  4. Step 4: Simplify right side
    1,245.40x = 961,602.57
  5. Step 5: Solve for x
    x = 961,602.57/1,245.40
  6. Step 6: Final answer
    x = 772.12

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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.