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Finding the Fourth Proportional to 1,187.97, 1,782.59 and 610.84

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Solution

The fourth proportional to 1,187.97, 1,782.59 and 610.84 is: 916.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.97 : 1,782.59 = 610.84 : x
  2. Step 2: Convert to fraction form
    1,187.97/1,782.59 = 610.84/x
  3. Step 3: Cross multiply
    1,187.97x = 1,782.59 × 610.84
  4. Step 4: Simplify right side
    1,187.97x = 1,088,877.28
  5. Step 5: Solve for x
    x = 1,088,877.28/1,187.97
  6. Step 6: Final answer
    x = 916.59

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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.