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Finding the Fourth Proportional to 8,996.40, 12,420.81 and 5,643.81

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Solution

The fourth proportional to 8,996.40, 12,420.81 and 5,643.81 is: 7,792.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,996.40 : 12,420.81 = 5,643.81 : x
  2. Step 2: Convert to fraction form
    8,996.40/12,420.81 = 5,643.81/x
  3. Step 3: Cross multiply
    8,996.40x = 12,420.81 × 5,643.81
  4. Step 4: Simplify right side
    8,996.40x = 70,100,691.69
  5. Step 5: Solve for x
    x = 70,100,691.69/8,996.40
  6. Step 6: Final answer
    x = 7,792.08

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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.