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Finding the Fourth Proportional to 2,713.18, 4,069.77 and 981.40

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Solution

The fourth proportional to 2,713.18, 4,069.77 and 981.40 is: 1,472.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,713.18 : 4,069.77 = 981.40 : x
  2. Step 2: Convert to fraction form
    2,713.18/4,069.77 = 981.40/x
  3. Step 3: Cross multiply
    2,713.18x = 4,069.77 × 981.40
  4. Step 4: Simplify right side
    2,713.18x = 3,994,047.02
  5. Step 5: Solve for x
    x = 3,994,047.02/2,713.18
  6. Step 6: Final answer
    x = 1,472.09

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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.