Home / 2,285.40-3,153.86-1,290.87

Finding the Fourth Proportional to 2,285.40, 3,153.86 and 1,290.87

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Solution

The fourth proportional to 2,285.40, 3,153.86 and 1,290.87 is: 1,781.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,285.40 : 3,153.86 = 1,290.87 : x
  2. Step 2: Convert to fraction form
    2,285.40/3,153.86 = 1,290.87/x
  3. Step 3: Cross multiply
    2,285.40x = 3,153.86 × 1,290.87
  4. Step 4: Simplify right side
    2,285.40x = 4,071,216.80
  5. Step 5: Solve for x
    x = 4,071,216.80/2,285.40
  6. Step 6: Final answer
    x = 1,781.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.