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Finding the Fourth Proportional to 7,715.10, 11,572.69 and 1,871.71

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Solution

The fourth proportional to 7,715.10, 11,572.69 and 1,871.71 is: 2,807.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,715.10 : 11,572.69 = 1,871.71 : x
  2. Step 2: Convert to fraction form
    7,715.10/11,572.69 = 1,871.71/x
  3. Step 3: Cross multiply
    7,715.10x = 11,572.69 × 1,871.71
  4. Step 4: Simplify right side
    7,715.10x = 21,660,719.60
  5. Step 5: Solve for x
    x = 21,660,719.60/7,715.10
  6. Step 6: Final answer
    x = 2,807.57

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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.