Home / 21,642.86-29,868-12,689.12

Finding the Fourth Proportional to 21,642.86, 29,868 and 12,689.12

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Solution

The fourth proportional to 21,642.86, 29,868 and 12,689.12 is: 17,511.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,642.86 : 29,868 = 12,689.12 : x
  2. Step 2: Convert to fraction form
    21,642.86/29,868 = 12,689.12/x
  3. Step 3: Cross multiply
    21,642.86x = 29,868 × 12,689.12
  4. Step 4: Simplify right side
    21,642.86x = 378,998,636.16
  5. Step 5: Solve for x
    x = 378,998,636.16/21,642.86
  6. Step 6: Final answer
    x = 17,511.49

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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.