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Finding the Fourth Proportional to 1,392.67, 2,090.06 and 515.71

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Solution

The fourth proportional to 1,392.67, 2,090.06 and 515.71 is: 773.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.67 : 2,090.06 = 515.71 : x
  2. Step 2: Convert to fraction form
    1,392.67/2,090.06 = 515.71/x
  3. Step 3: Cross multiply
    1,392.67x = 2,090.06 × 515.71
  4. Step 4: Simplify right side
    1,392.67x = 1,077,856.89
  5. Step 5: Solve for x
    x = 1,077,856.89/1,392.67
  6. Step 6: Final answer
    x = 773.95

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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.