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Finding the Fourth Proportional to 8,720.84, 11,988.38 and 7,505.10

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Solution

The fourth proportional to 8,720.84, 11,988.38 and 7,505.10 is: 10,317.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.84 : 11,988.38 = 7,505.10 : x
  2. Step 2: Convert to fraction form
    8,720.84/11,988.38 = 7,505.10/x
  3. Step 3: Cross multiply
    8,720.84x = 11,988.38 × 7,505.10
  4. Step 4: Simplify right side
    8,720.84x = 89,973,990.74
  5. Step 5: Solve for x
    x = 89,973,990.74/8,720.84
  6. Step 6: Final answer
    x = 10,317.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.