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Finding the Fourth Proportional to 2,077.35, 3,115.12 and 777.91

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Solution

The fourth proportional to 2,077.35, 3,115.12 and 777.91 is: 1,166.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,077.35 : 3,115.12 = 777.91 : x
  2. Step 2: Convert to fraction form
    2,077.35/3,115.12 = 777.91/x
  3. Step 3: Cross multiply
    2,077.35x = 3,115.12 × 777.91
  4. Step 4: Simplify right side
    2,077.35x = 2,423,284.95
  5. Step 5: Solve for x
    x = 2,423,284.95/2,077.35
  6. Step 6: Final answer
    x = 1,166.52

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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.