Home / 1,439.50-2,160.28-515.06

Finding the Fourth Proportional to 1,439.50, 2,160.28 and 515.06

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Solution

The fourth proportional to 1,439.50, 2,160.28 and 515.06 is: 772.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.50 : 2,160.28 = 515.06 : x
  2. Step 2: Convert to fraction form
    1,439.50/2,160.28 = 515.06/x
  3. Step 3: Cross multiply
    1,439.50x = 2,160.28 × 515.06
  4. Step 4: Simplify right side
    1,439.50x = 1,112,673.82
  5. Step 5: Solve for x
    x = 1,112,673.82/1,439.50
  6. Step 6: Final answer
    x = 772.96

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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.