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Finding the Fourth Proportional to 8,715.81, 12,040.08 and 7,928.49

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Solution

The fourth proportional to 8,715.81, 12,040.08 and 7,928.49 is: 10,952.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,715.81 : 12,040.08 = 7,928.49 : x
  2. Step 2: Convert to fraction form
    8,715.81/12,040.08 = 7,928.49/x
  3. Step 3: Cross multiply
    8,715.81x = 12,040.08 × 7,928.49
  4. Step 4: Simplify right side
    8,715.81x = 95,459,653.88
  5. Step 5: Solve for x
    x = 95,459,653.88/8,715.81
  6. Step 6: Final answer
    x = 10,952.47

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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.