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Finding the Fourth Proportional to 1,785.90, 2,678.85 and 812.28

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Solution

The fourth proportional to 1,785.90, 2,678.85 and 812.28 is: 1,218.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.90 : 2,678.85 = 812.28 : x
  2. Step 2: Convert to fraction form
    1,785.90/2,678.85 = 812.28/x
  3. Step 3: Cross multiply
    1,785.90x = 2,678.85 × 812.28
  4. Step 4: Simplify right side
    1,785.90x = 2,175,980.64
  5. Step 5: Solve for x
    x = 2,175,980.64/1,785.90
  6. Step 6: Final answer
    x = 1,218.42

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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.