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Finding the Fourth Proportional to 1,187.51, 1,781.12 and 321.75

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Solution

The fourth proportional to 1,187.51, 1,781.12 and 321.75 is: 482.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.51 : 1,781.12 = 321.75 : x
  2. Step 2: Convert to fraction form
    1,187.51/1,781.12 = 321.75/x
  3. Step 3: Cross multiply
    1,187.51x = 1,781.12 × 321.75
  4. Step 4: Simplify right side
    1,187.51x = 573,075.36
  5. Step 5: Solve for x
    x = 573,075.36/1,187.51
  6. Step 6: Final answer
    x = 482.59

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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.