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Finding the Fourth Proportional to 917.51, 1,261.97 and 793.47

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Solution

The fourth proportional to 917.51, 1,261.97 and 793.47 is: 1,091.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.51 : 1,261.97 = 793.47 : x
  2. Step 2: Convert to fraction form
    917.51/1,261.97 = 793.47/x
  3. Step 3: Cross multiply
    917.51x = 1,261.97 × 793.47
  4. Step 4: Simplify right side
    917.51x = 1,001,334.41
  5. Step 5: Solve for x
    x = 1,001,334.41/917.51
  6. Step 6: Final answer
    x = 1,091.35

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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.