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Finding the Fourth Proportional to 9,661.28, 13,356.93 and 7,139.41

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Solution

The fourth proportional to 9,661.28, 13,356.93 and 7,139.41 is: 9,870.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,661.28 : 13,356.93 = 7,139.41 : x
  2. Step 2: Convert to fraction form
    9,661.28/13,356.93 = 7,139.41/x
  3. Step 3: Cross multiply
    9,661.28x = 13,356.93 × 7,139.41
  4. Step 4: Simplify right side
    9,661.28x = 95,360,592.99
  5. Step 5: Solve for x
    x = 95,360,592.99/9,661.28
  6. Step 6: Final answer
    x = 9,870.39

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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.