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Finding the Fourth Proportional to 1,867.19, 2,800.71 and 770.31

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Solution

The fourth proportional to 1,867.19, 2,800.71 and 770.31 is: 1,155.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,867.19 : 2,800.71 = 770.31 : x
  2. Step 2: Convert to fraction form
    1,867.19/2,800.71 = 770.31/x
  3. Step 3: Cross multiply
    1,867.19x = 2,800.71 × 770.31
  4. Step 4: Simplify right side
    1,867.19x = 2,157,414.92
  5. Step 5: Solve for x
    x = 2,157,414.92/1,867.19
  6. Step 6: Final answer
    x = 1,155.44

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1.5x scale

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.