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Finding the Fourth Proportional to 1,187.43, 1,780.59 and 407.22

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Solution

The fourth proportional to 1,187.43, 1,780.59 and 407.22 is: 610.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.43 : 1,780.59 = 407.22 : x
  2. Step 2: Convert to fraction form
    1,187.43/1,780.59 = 407.22/x
  3. Step 3: Cross multiply
    1,187.43x = 1,780.59 × 407.22
  4. Step 4: Simplify right side
    1,187.43x = 725,091.86
  5. Step 5: Solve for x
    x = 725,091.86/1,187.43
  6. Step 6: Final answer
    x = 610.64

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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.