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Finding the Fourth Proportional to 15,903.89, 21,950.19 and 11,890.85

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Solution

The fourth proportional to 15,903.89, 21,950.19 and 11,890.85 is: 16,411.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,903.89 : 21,950.19 = 11,890.85 : x
  2. Step 2: Convert to fraction form
    15,903.89/21,950.19 = 11,890.85/x
  3. Step 3: Cross multiply
    15,903.89x = 21,950.19 × 11,890.85
  4. Step 4: Simplify right side
    15,903.89x = 261,006,430.48
  5. Step 5: Solve for x
    x = 261,006,430.48/15,903.89
  6. Step 6: Final answer
    x = 16,411.48

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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.