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Finding the Fourth Proportional to 1,248.94, 1,870.21 and 1,211.99

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Solution

The fourth proportional to 1,248.94, 1,870.21 and 1,211.99 is: 1,814.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.94 : 1,870.21 = 1,211.99 : x
  2. Step 2: Convert to fraction form
    1,248.94/1,870.21 = 1,211.99/x
  3. Step 3: Cross multiply
    1,248.94x = 1,870.21 × 1,211.99
  4. Step 4: Simplify right side
    1,248.94x = 2,266,663.44
  5. Step 5: Solve for x
    x = 2,266,663.44/1,248.94
  6. Step 6: Final answer
    x = 1,814.87

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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.