Home / 1,315.31-1,973.77-768.56

Finding the Fourth Proportional to 1,315.31, 1,973.77 and 768.56

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Solution

The fourth proportional to 1,315.31, 1,973.77 and 768.56 is: 1,153.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.31 : 1,973.77 = 768.56 : x
  2. Step 2: Convert to fraction form
    1,315.31/1,973.77 = 768.56/x
  3. Step 3: Cross multiply
    1,315.31x = 1,973.77 × 768.56
  4. Step 4: Simplify right side
    1,315.31x = 1,516,948.88
  5. Step 5: Solve for x
    x = 1,516,948.88/1,315.31
  6. Step 6: Final answer
    x = 1,153.31

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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.