Home / 1,911.40-2,867.28-612.40

Finding the Fourth Proportional to 1,911.40, 2,867.28 and 612.40

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Solution

The fourth proportional to 1,911.40, 2,867.28 and 612.40 is: 918.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.40 : 2,867.28 = 612.40 : x
  2. Step 2: Convert to fraction form
    1,911.40/2,867.28 = 612.40/x
  3. Step 3: Cross multiply
    1,911.40x = 2,867.28 × 612.40
  4. Step 4: Simplify right side
    1,911.40x = 1,755,922.27
  5. Step 5: Solve for x
    x = 1,755,922.27/1,911.40
  6. Step 6: Final answer
    x = 918.66

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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.