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Finding the Fourth Proportional to 1,858.71, 2,785.11 and 981.18

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Solution

The fourth proportional to 1,858.71, 2,785.11 and 981.18 is: 1,470.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.71 : 2,785.11 = 981.18 : x
  2. Step 2: Convert to fraction form
    1,858.71/2,785.11 = 981.18/x
  3. Step 3: Cross multiply
    1,858.71x = 2,785.11 × 981.18
  4. Step 4: Simplify right side
    1,858.71x = 2,732,706.51
  5. Step 5: Solve for x
    x = 2,732,706.51/1,858.71
  6. Step 6: Final answer
    x = 1,470.21

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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.