Home / 15,918.12-21,916.67-12,129.12

Finding the Fourth Proportional to 15,918.12, 21,916.67 and 12,129.12

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Solution

The fourth proportional to 15,918.12, 21,916.67 and 12,129.12 is: 16,699.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,918.12 : 21,916.67 = 12,129.12 : x
  2. Step 2: Convert to fraction form
    15,918.12/21,916.67 = 12,129.12/x
  3. Step 3: Cross multiply
    15,918.12x = 21,916.67 × 12,129.12
  4. Step 4: Simplify right side
    15,918.12x = 265,829,859.78
  5. Step 5: Solve for x
    x = 265,829,859.78/15,918.12
  6. Step 6: Final answer
    x = 16,699.83

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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.