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Finding the Fourth Proportional to 1,877.58, 2,814.84 and 782.78

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Solution

The fourth proportional to 1,877.58, 2,814.84 and 782.78 is: 1,173.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,877.58 : 2,814.84 = 782.78 : x
  2. Step 2: Convert to fraction form
    1,877.58/2,814.84 = 782.78/x
  3. Step 3: Cross multiply
    1,877.58x = 2,814.84 × 782.78
  4. Step 4: Simplify right side
    1,877.58x = 2,203,386.38
  5. Step 5: Solve for x
    x = 2,203,386.38/1,877.58
  6. Step 6: Final answer
    x = 1,173.52

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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.