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Finding the Fourth Proportional to 1,785.21, 2,678.92 and 860.86

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Solution

The fourth proportional to 1,785.21, 2,678.92 and 860.86 is: 1,291.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.21 : 2,678.92 = 860.86 : x
  2. Step 2: Convert to fraction form
    1,785.21/2,678.92 = 860.86/x
  3. Step 3: Cross multiply
    1,785.21x = 2,678.92 × 860.86
  4. Step 4: Simplify right side
    1,785.21x = 2,306,175.07
  5. Step 5: Solve for x
    x = 2,306,175.07/1,785.21
  6. Step 6: Final answer
    x = 1,291.82

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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.