Home / 2,115.51-2,920.50-1,319.09

Finding the Fourth Proportional to 2,115.51, 2,920.50 and 1,319.09

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Solution

The fourth proportional to 2,115.51, 2,920.50 and 1,319.09 is: 1,821.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.51 : 2,920.50 = 1,319.09 : x
  2. Step 2: Convert to fraction form
    2,115.51/2,920.50 = 1,319.09/x
  3. Step 3: Cross multiply
    2,115.51x = 2,920.50 × 1,319.09
  4. Step 4: Simplify right side
    2,115.51x = 3,852,387.74
  5. Step 5: Solve for x
    x = 3,852,387.74/2,115.51
  6. Step 6: Final answer
    x = 1,821.02

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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.