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Finding the Fourth Proportional to 1,878.69, 2,818.19 and 783.78

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Solution

The fourth proportional to 1,878.69, 2,818.19 and 783.78 is: 1,175.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.69 : 2,818.19 = 783.78 : x
  2. Step 2: Convert to fraction form
    1,878.69/2,818.19 = 783.78/x
  3. Step 3: Cross multiply
    1,878.69x = 2,818.19 × 783.78
  4. Step 4: Simplify right side
    1,878.69x = 2,208,832.35
  5. Step 5: Solve for x
    x = 2,208,832.35/1,878.69
  6. Step 6: Final answer
    x = 1,175.73

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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.