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Finding the Fourth Proportional to 1,867.80, 2,801.63 and 771.34

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Solution

The fourth proportional to 1,867.80, 2,801.63 and 771.34 is: 1,156.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,867.80 : 2,801.63 = 771.34 : x
  2. Step 2: Convert to fraction form
    1,867.80/2,801.63 = 771.34/x
  3. Step 3: Cross multiply
    1,867.80x = 2,801.63 × 771.34
  4. Step 4: Simplify right side
    1,867.80x = 2,161,005.43
  5. Step 5: Solve for x
    x = 2,161,005.43/1,867.80
  6. Step 6: Final answer
    x = 1,156.98

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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.