Home / 1,281.20-1,921.95-403.77

Finding the Fourth Proportional to 1,281.20, 1,921.95 and 403.77

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Solution

The fourth proportional to 1,281.20, 1,921.95 and 403.77 is: 605.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.20 : 1,921.95 = 403.77 : x
  2. Step 2: Convert to fraction form
    1,281.20/1,921.95 = 403.77/x
  3. Step 3: Cross multiply
    1,281.20x = 1,921.95 × 403.77
  4. Step 4: Simplify right side
    1,281.20x = 776,025.75
  5. Step 5: Solve for x
    x = 776,025.75/1,281.20
  6. Step 6: Final answer
    x = 605.70

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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.