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Finding the Fourth Proportional to 1,185.24, 1,775.28 and 859.89

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Solution

The fourth proportional to 1,185.24, 1,775.28 and 859.89 is: 1,287.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.24 : 1,775.28 = 859.89 : x
  2. Step 2: Convert to fraction form
    1,185.24/1,775.28 = 859.89/x
  3. Step 3: Cross multiply
    1,185.24x = 1,775.28 × 859.89
  4. Step 4: Simplify right side
    1,185.24x = 1,526,545.52
  5. Step 5: Solve for x
    x = 1,526,545.52/1,185.24
  6. Step 6: Final answer
    x = 1,287.96

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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.