Home / 1,440.12-2,159.24-515.21

Finding the Fourth Proportional to 1,440.12, 2,159.24 and 515.21

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Solution

The fourth proportional to 1,440.12, 2,159.24 and 515.21 is: 772.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.12 : 2,159.24 = 515.21 : x
  2. Step 2: Convert to fraction form
    1,440.12/2,159.24 = 515.21/x
  3. Step 3: Cross multiply
    1,440.12x = 2,159.24 × 515.21
  4. Step 4: Simplify right side
    1,440.12x = 1,112,448.67
  5. Step 5: Solve for x
    x = 1,112,448.67/1,440.12
  6. Step 6: Final answer
    x = 772.47

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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.