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Finding the Fourth Proportional to 1,187.10, 1,780.65 and 321.39

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Solution

The fourth proportional to 1,187.10, 1,780.65 and 321.39 is: 482.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.10 : 1,780.65 = 321.39 : x
  2. Step 2: Convert to fraction form
    1,187.10/1,780.65 = 321.39/x
  3. Step 3: Cross multiply
    1,187.10x = 1,780.65 × 321.39
  4. Step 4: Simplify right side
    1,187.10x = 572,283.10
  5. Step 5: Solve for x
    x = 572,283.10/1,187.10
  6. Step 6: Final answer
    x = 482.09

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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.