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Finding the Fourth Proportional to 9,410.79, 12,986.80 and 5,161.76

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Solution

The fourth proportional to 9,410.79, 12,986.80 and 5,161.76 is: 7,123.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,410.79 : 12,986.80 = 5,161.76 : x
  2. Step 2: Convert to fraction form
    9,410.79/12,986.80 = 5,161.76/x
  3. Step 3: Cross multiply
    9,410.79x = 12,986.80 × 5,161.76
  4. Step 4: Simplify right side
    9,410.79x = 67,034,777.24
  5. Step 5: Solve for x
    x = 67,034,777.24/9,410.79
  6. Step 6: Final answer
    x = 7,123.18

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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.