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Finding the Fourth Proportional to 9,791.61, 13,512.48 and 5,315.40

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Solution

The fourth proportional to 9,791.61, 13,512.48 and 5,315.40 is: 7,335.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,791.61 : 13,512.48 = 5,315.40 : x
  2. Step 2: Convert to fraction form
    9,791.61/13,512.48 = 5,315.40/x
  3. Step 3: Cross multiply
    9,791.61x = 13,512.48 × 5,315.40
  4. Step 4: Simplify right side
    9,791.61x = 71,824,236.19
  5. Step 5: Solve for x
    x = 71,824,236.19/9,791.61
  6. Step 6: Final answer
    x = 7,335.28

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1.5x scale

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.