Home / 1,276.30-1,914.75-398.77

Finding the Fourth Proportional to 1,276.30, 1,914.75 and 398.77

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Solution

The fourth proportional to 1,276.30, 1,914.75 and 398.77 is: 598.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.30 : 1,914.75 = 398.77 : x
  2. Step 2: Convert to fraction form
    1,276.30/1,914.75 = 398.77/x
  3. Step 3: Cross multiply
    1,276.30x = 1,914.75 × 398.77
  4. Step 4: Simplify right side
    1,276.30x = 763,544.86
  5. Step 5: Solve for x
    x = 763,544.86/1,276.30
  6. Step 6: Final answer
    x = 598.25

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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.