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Finding the Fourth Proportional to 8,720.40, 13,061.40 and 7,568.40

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Solution

The fourth proportional to 8,720.40, 13,061.40 and 7,568.40 is: 11,335.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.40 : 13,061.40 = 7,568.40 : x
  2. Step 2: Convert to fraction form
    8,720.40/13,061.40 = 7,568.40/x
  3. Step 3: Cross multiply
    8,720.40x = 13,061.40 × 7,568.40
  4. Step 4: Simplify right side
    8,720.40x = 98,853,899.76
  5. Step 5: Solve for x
    x = 98,853,899.76/8,720.40
  6. Step 6: Final answer
    x = 11,335.94

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.