Home / 1,420.05-1,959.53-1,315.56

Finding the Fourth Proportional to 1,420.05, 1,959.53 and 1,315.56

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Solution

The fourth proportional to 1,420.05, 1,959.53 and 1,315.56 is: 1,815.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.05 : 1,959.53 = 1,315.56 : x
  2. Step 2: Convert to fraction form
    1,420.05/1,959.53 = 1,315.56/x
  3. Step 3: Cross multiply
    1,420.05x = 1,959.53 × 1,315.56
  4. Step 4: Simplify right side
    1,420.05x = 2,577,872.71
  5. Step 5: Solve for x
    x = 2,577,872.71/1,420.05
  6. Step 6: Final answer
    x = 1,815.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.