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Finding the Fourth Proportional to 9,716.80, 13,404.36 and 8,390.20

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Solution

The fourth proportional to 9,716.80, 13,404.36 and 8,390.20 is: 11,574.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,716.80 : 13,404.36 = 8,390.20 : x
  2. Step 2: Convert to fraction form
    9,716.80/13,404.36 = 8,390.20/x
  3. Step 3: Cross multiply
    9,716.80x = 13,404.36 × 8,390.20
  4. Step 4: Simplify right side
    9,716.80x = 112,465,261.27
  5. Step 5: Solve for x
    x = 112,465,261.27/9,716.80
  6. Step 6: Final answer
    x = 11,574.31

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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.