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Finding the Fourth Proportional to 1,785.70, 2,678.55 and 1,515.70

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Solution

The fourth proportional to 1,785.70, 2,678.55 and 1,515.70 is: 2,273.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.70 : 2,678.55 = 1,515.70 : x
  2. Step 2: Convert to fraction form
    1,785.70/2,678.55 = 1,515.70/x
  3. Step 3: Cross multiply
    1,785.70x = 2,678.55 × 1,515.70
  4. Step 4: Simplify right side
    1,785.70x = 4,059,878.24
  5. Step 5: Solve for x
    x = 4,059,878.24/1,785.70
  6. Step 6: Final answer
    x = 2,273.55

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1.5x scale

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.