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Finding the Fourth Proportional to 8,931.86, 13,391.88 and 3,994.70

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Solution

The fourth proportional to 8,931.86, 13,391.88 and 3,994.70 is: 5,989.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,931.86 : 13,391.88 = 3,994.70 : x
  2. Step 2: Convert to fraction form
    8,931.86/13,391.88 = 3,994.70/x
  3. Step 3: Cross multiply
    8,931.86x = 13,391.88 × 3,994.70
  4. Step 4: Simplify right side
    8,931.86x = 53,496,543.04
  5. Step 5: Solve for x
    x = 53,496,543.04/8,931.86
  6. Step 6: Final answer
    x = 5,989.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.