Home / 1,356.80-2,035.20-1,281.20

Finding the Fourth Proportional to 1,356.80, 2,035.20 and 1,281.20

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Solution

The fourth proportional to 1,356.80, 2,035.20 and 1,281.20 is: 1,921.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.80 : 2,035.20 = 1,281.20 : x
  2. Step 2: Convert to fraction form
    1,356.80/2,035.20 = 1,281.20/x
  3. Step 3: Cross multiply
    1,356.80x = 2,035.20 × 1,281.20
  4. Step 4: Simplify right side
    1,356.80x = 2,607,498.24
  5. Step 5: Solve for x
    x = 2,607,498.24/1,356.80
  6. Step 6: Final answer
    x = 1,921.80

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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.