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Finding the Fourth Proportional to 1,211.95, 1,818.06 and 518.86

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Solution

The fourth proportional to 1,211.95, 1,818.06 and 518.86 is: 778.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.95 : 1,818.06 = 518.86 : x
  2. Step 2: Convert to fraction form
    1,211.95/1,818.06 = 518.86/x
  3. Step 3: Cross multiply
    1,211.95x = 1,818.06 × 518.86
  4. Step 4: Simplify right side
    1,211.95x = 943,318.61
  5. Step 5: Solve for x
    x = 943,318.61/1,211.95
  6. Step 6: Final answer
    x = 778.35

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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.