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Finding the Fourth Proportional to 1,188, 1,780.32 and 571.20

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Solution

The fourth proportional to 1,188, 1,780.32 and 571.20 is: 855.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188 : 1,780.32 = 571.20 : x
  2. Step 2: Convert to fraction form
    1,188/1,780.32 = 571.20/x
  3. Step 3: Cross multiply
    1,188x = 1,780.32 × 571.20
  4. Step 4: Simplify right side
    1,188x = 1,016,918.78
  5. Step 5: Solve for x
    x = 1,016,918.78/1,188
  6. Step 6: Final answer
    x = 855.99

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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.