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Finding the Fourth Proportional to 1,352.51, 1,866.16 and 911.66

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Solution

The fourth proportional to 1,352.51, 1,866.16 and 911.66 is: 1,257.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,352.51 : 1,866.16 = 911.66 : x
  2. Step 2: Convert to fraction form
    1,352.51/1,866.16 = 911.66/x
  3. Step 3: Cross multiply
    1,352.51x = 1,866.16 × 911.66
  4. Step 4: Simplify right side
    1,352.51x = 1,701,298.87
  5. Step 5: Solve for x
    x = 1,701,298.87/1,352.51
  6. Step 6: Final answer
    x = 1,257.89

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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.