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Finding the Fourth Proportional to 1,187.10, 1,780.65 and 365.49

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Solution

The fourth proportional to 1,187.10, 1,780.65 and 365.49 is: 548.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.10 : 1,780.65 = 365.49 : x
  2. Step 2: Convert to fraction form
    1,187.10/1,780.65 = 365.49/x
  3. Step 3: Cross multiply
    1,187.10x = 1,780.65 × 365.49
  4. Step 4: Simplify right side
    1,187.10x = 650,809.77
  5. Step 5: Solve for x
    x = 650,809.77/1,187.10
  6. Step 6: Final answer
    x = 548.24

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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.