Home / 3,115.40-4,290.18-2,521.40

Finding the Fourth Proportional to 3,115.40, 4,290.18 and 2,521.40

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Solution

The fourth proportional to 3,115.40, 4,290.18 and 2,521.40 is: 3,472.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,115.40 : 4,290.18 = 2,521.40 : x
  2. Step 2: Convert to fraction form
    3,115.40/4,290.18 = 2,521.40/x
  3. Step 3: Cross multiply
    3,115.40x = 4,290.18 × 2,521.40
  4. Step 4: Simplify right side
    3,115.40x = 10,817,259.85
  5. Step 5: Solve for x
    x = 10,817,259.85/3,115.40
  6. Step 6: Final answer
    x = 3,472.19

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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.