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Finding the Fourth Proportional to 8,939.84, 13,315.32 and 8,471.46

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Solution

The fourth proportional to 8,939.84, 13,315.32 and 8,471.46 is: 12,617.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,939.84 : 13,315.32 = 8,471.46 : x
  2. Step 2: Convert to fraction form
    8,939.84/13,315.32 = 8,471.46/x
  3. Step 3: Cross multiply
    8,939.84x = 13,315.32 × 8,471.46
  4. Step 4: Simplify right side
    8,939.84x = 112,800,200.77
  5. Step 5: Solve for x
    x = 112,800,200.77/8,939.84
  6. Step 6: Final answer
    x = 12,617.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.