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Finding the Fourth Proportional to 1,865.48, 2,798.80 and 770.36

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Solution

The fourth proportional to 1,865.48, 2,798.80 and 770.36 is: 1,155.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,865.48 : 2,798.80 = 770.36 : x
  2. Step 2: Convert to fraction form
    1,865.48/2,798.80 = 770.36/x
  3. Step 3: Cross multiply
    1,865.48x = 2,798.80 × 770.36
  4. Step 4: Simplify right side
    1,865.48x = 2,156,083.57
  5. Step 5: Solve for x
    x = 2,156,083.57/1,865.48
  6. Step 6: Final answer
    x = 1,155.78

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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.