Home / 1,025.20-1,420.76-1,005.76

Finding the Fourth Proportional to 1,025.20, 1,420.76 and 1,005.76

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Solution

The fourth proportional to 1,025.20, 1,420.76 and 1,005.76 is: 1,393.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.20 : 1,420.76 = 1,005.76 : x
  2. Step 2: Convert to fraction form
    1,025.20/1,420.76 = 1,005.76/x
  3. Step 3: Cross multiply
    1,025.20x = 1,420.76 × 1,005.76
  4. Step 4: Simplify right side
    1,025.20x = 1,428,943.58
  5. Step 5: Solve for x
    x = 1,428,943.58/1,025.20
  6. Step 6: Final answer
    x = 1,393.82

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.