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Finding the Fourth Proportional to 8,621.70, 11,894.90 and 5,639.28

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Solution

The fourth proportional to 8,621.70, 11,894.90 and 5,639.28 is: 7,780.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,621.70 : 11,894.90 = 5,639.28 : x
  2. Step 2: Convert to fraction form
    8,621.70/11,894.90 = 5,639.28/x
  3. Step 3: Cross multiply
    8,621.70x = 11,894.90 × 5,639.28
  4. Step 4: Simplify right side
    8,621.70x = 67,078,643.48
  5. Step 5: Solve for x
    x = 67,078,643.48/8,621.70
  6. Step 6: Final answer
    x = 7,780.21

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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.