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Finding the Fourth Proportional to 15,122.81, 20,871.75 and 10,887.89

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Solution

The fourth proportional to 15,122.81, 20,871.75 and 10,887.89 is: 15,026.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,122.81 : 20,871.75 = 10,887.89 : x
  2. Step 2: Convert to fraction form
    15,122.81/20,871.75 = 10,887.89/x
  3. Step 3: Cross multiply
    15,122.81x = 20,871.75 × 10,887.89
  4. Step 4: Simplify right side
    15,122.81x = 227,249,318.11
  5. Step 5: Solve for x
    x = 227,249,318.11/15,122.81
  6. Step 6: Final answer
    x = 15,026.92

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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.