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Finding the Fourth Proportional to 1,188, 1,780.71 and 407.27

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Solution

The fourth proportional to 1,188, 1,780.71 and 407.27 is: 610.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188 : 1,780.71 = 407.27 : x
  2. Step 2: Convert to fraction form
    1,188/1,780.71 = 407.27/x
  3. Step 3: Cross multiply
    1,188x = 1,780.71 × 407.27
  4. Step 4: Simplify right side
    1,188x = 725,220.86
  5. Step 5: Solve for x
    x = 725,220.86/1,188
  6. Step 6: Final answer
    x = 610.46

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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.