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Finding the Fourth Proportional to 8,921.79, 12,310.43 and 5,776.16

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Solution

The fourth proportional to 8,921.79, 12,310.43 and 5,776.16 is: 7,970.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,921.79 : 12,310.43 = 5,776.16 : x
  2. Step 2: Convert to fraction form
    8,921.79/12,310.43 = 5,776.16/x
  3. Step 3: Cross multiply
    8,921.79x = 12,310.43 × 5,776.16
  4. Step 4: Simplify right side
    8,921.79x = 71,106,922.92
  5. Step 5: Solve for x
    x = 71,106,922.92/8,921.79
  6. Step 6: Final answer
    x = 7,970.03

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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.