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Finding the Fourth Proportional to 1,125.81, 1,555.61 and 866.07

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Solution

The fourth proportional to 1,125.81, 1,555.61 and 866.07 is: 1,196.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.81 : 1,555.61 = 866.07 : x
  2. Step 2: Convert to fraction form
    1,125.81/1,555.61 = 866.07/x
  3. Step 3: Cross multiply
    1,125.81x = 1,555.61 × 866.07
  4. Step 4: Simplify right side
    1,125.81x = 1,347,262.82
  5. Step 5: Solve for x
    x = 1,347,262.82/1,125.81
  6. Step 6: Final answer
    x = 1,196.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.