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Finding the Fourth Proportional to 8,917.64, 12,289.74 and 7,314.95

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Solution

The fourth proportional to 8,917.64, 12,289.74 and 7,314.95 is: 10,081.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,917.64 : 12,289.74 = 7,314.95 : x
  2. Step 2: Convert to fraction form
    8,917.64/12,289.74 = 7,314.95/x
  3. Step 3: Cross multiply
    8,917.64x = 12,289.74 × 7,314.95
  4. Step 4: Simplify right side
    8,917.64x = 89,898,824.78
  5. Step 5: Solve for x
    x = 89,898,824.78/8,917.64
  6. Step 6: Final answer
    x = 10,081.01

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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.