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Finding the Fourth Proportional to 1,246.67, 1,870.05 and 515.78

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Solution

The fourth proportional to 1,246.67, 1,870.05 and 515.78 is: 773.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.67 : 1,870.05 = 515.78 : x
  2. Step 2: Convert to fraction form
    1,246.67/1,870.05 = 515.78/x
  3. Step 3: Cross multiply
    1,246.67x = 1,870.05 × 515.78
  4. Step 4: Simplify right side
    1,246.67x = 964,534.39
  5. Step 5: Solve for x
    x = 964,534.39/1,246.67
  6. Step 6: Final answer
    x = 773.69

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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.