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Finding the Fourth Proportional to 8,900.72, 12,288.86 and 6,880.40

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Solution

The fourth proportional to 8,900.72, 12,288.86 and 6,880.40 is: 9,499.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,900.72 : 12,288.86 = 6,880.40 : x
  2. Step 2: Convert to fraction form
    8,900.72/12,288.86 = 6,880.40/x
  3. Step 3: Cross multiply
    8,900.72x = 12,288.86 × 6,880.40
  4. Step 4: Simplify right side
    8,900.72x = 84,552,272.34
  5. Step 5: Solve for x
    x = 84,552,272.34/8,900.72
  6. Step 6: Final answer
    x = 9,499.49

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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.