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Finding the Fourth Proportional to 1,865.68, 2,799.14 and 770.36

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Solution

The fourth proportional to 1,865.68, 2,799.14 and 770.36 is: 1,155.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,865.68 : 2,799.14 = 770.36 : x
  2. Step 2: Convert to fraction form
    1,865.68/2,799.14 = 770.36/x
  3. Step 3: Cross multiply
    1,865.68x = 2,799.14 × 770.36
  4. Step 4: Simplify right side
    1,865.68x = 2,156,345.49
  5. Step 5: Solve for x
    x = 2,156,345.49/1,865.68
  6. Step 6: Final answer
    x = 1,155.80

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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.