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Finding the Fourth Proportional to 1,865.38, 2,799.96 and 770.40

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Solution

The fourth proportional to 1,865.38, 2,799.96 and 770.40 is: 1,156.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,865.38 : 2,799.96 = 770.40 : x
  2. Step 2: Convert to fraction form
    1,865.38/2,799.96 = 770.40/x
  3. Step 3: Cross multiply
    1,865.38x = 2,799.96 × 770.40
  4. Step 4: Simplify right side
    1,865.38x = 2,157,089.18
  5. Step 5: Solve for x
    x = 2,157,089.18/1,865.38
  6. Step 6: Final answer
    x = 1,156.38

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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.