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Finding the Fourth Proportional to 1,859.31, 2,786 and 981.78

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Solution

The fourth proportional to 1,859.31, 2,786 and 981.78 is: 1,471.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,859.31 : 2,786 = 981.78 : x
  2. Step 2: Convert to fraction form
    1,859.31/2,786 = 981.78/x
  3. Step 3: Cross multiply
    1,859.31x = 2,786 × 981.78
  4. Step 4: Simplify right side
    1,859.31x = 2,735,239.08
  5. Step 5: Solve for x
    x = 2,735,239.08/1,859.31
  6. Step 6: Final answer
    x = 1,471.10

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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.