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Finding the Fourth Proportional to 1,878.78, 2,818.96 and 783.38

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Solution

The fourth proportional to 1,878.78, 2,818.96 and 783.38 is: 1,175.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.78 : 2,818.96 = 783.38 : x
  2. Step 2: Convert to fraction form
    1,878.78/2,818.96 = 783.38/x
  3. Step 3: Cross multiply
    1,878.78x = 2,818.96 × 783.38
  4. Step 4: Simplify right side
    1,878.78x = 2,208,316.88
  5. Step 5: Solve for x
    x = 2,208,316.88/1,878.78
  6. Step 6: Final answer
    x = 1,175.40

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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.