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Finding the Fourth Proportional to 9,315.66, 12,855.03 and 5,123.10

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Solution

The fourth proportional to 9,315.66, 12,855.03 and 5,123.10 is: 7,069.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,315.66 : 12,855.03 = 5,123.10 : x
  2. Step 2: Convert to fraction form
    9,315.66/12,855.03 = 5,123.10/x
  3. Step 3: Cross multiply
    9,315.66x = 12,855.03 × 5,123.10
  4. Step 4: Simplify right side
    9,315.66x = 65,857,604.19
  5. Step 5: Solve for x
    x = 65,857,604.19/9,315.66
  6. Step 6: Final answer
    x = 7,069.56

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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.