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Finding the Fourth Proportional to 1,767.88, 2,439.61 and 981.91

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Solution

The fourth proportional to 1,767.88, 2,439.61 and 981.91 is: 1,355.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,767.88 : 2,439.61 = 981.91 : x
  2. Step 2: Convert to fraction form
    1,767.88/2,439.61 = 981.91/x
  3. Step 3: Cross multiply
    1,767.88x = 2,439.61 × 981.91
  4. Step 4: Simplify right side
    1,767.88x = 2,395,468.90
  5. Step 5: Solve for x
    x = 2,395,468.90/1,767.88
  6. Step 6: Final answer
    x = 1,355.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.