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Finding the Fourth Proportional to 8,889.28, 12,258.40 and 6,899.12

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Solution

The fourth proportional to 8,889.28, 12,258.40 and 6,899.12 is: 9,513.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,889.28 : 12,258.40 = 6,899.12 : x
  2. Step 2: Convert to fraction form
    8,889.28/12,258.40 = 6,899.12/x
  3. Step 3: Cross multiply
    8,889.28x = 12,258.40 × 6,899.12
  4. Step 4: Simplify right side
    8,889.28x = 84,572,172.61
  5. Step 5: Solve for x
    x = 84,572,172.61/8,889.28
  6. Step 6: Final answer
    x = 9,513.95

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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.