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Finding the Fourth Proportional to 912.57, 1,365.73 and 766.47

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Solution

The fourth proportional to 912.57, 1,365.73 and 766.47 is: 1,147.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.57 : 1,365.73 = 766.47 : x
  2. Step 2: Convert to fraction form
    912.57/1,365.73 = 766.47/x
  3. Step 3: Cross multiply
    912.57x = 1,365.73 × 766.47
  4. Step 4: Simplify right side
    912.57x = 1,046,791.07
  5. Step 5: Solve for x
    x = 1,046,791.07/912.57
  6. Step 6: Final answer
    x = 1,147.08

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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.