Home / 2,178.78-3,005.07-1,515.30

Finding the Fourth Proportional to 2,178.78, 3,005.07 and 1,515.30

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Solution

The fourth proportional to 2,178.78, 3,005.07 and 1,515.30 is: 2,089.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,178.78 : 3,005.07 = 1,515.30 : x
  2. Step 2: Convert to fraction form
    2,178.78/3,005.07 = 1,515.30/x
  3. Step 3: Cross multiply
    2,178.78x = 3,005.07 × 1,515.30
  4. Step 4: Simplify right side
    2,178.78x = 4,553,582.57
  5. Step 5: Solve for x
    x = 4,553,582.57/2,178.78
  6. Step 6: Final answer
    x = 2,089.97

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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.