Home / 21,511.80-29,686.32-12,080.34

Finding the Fourth Proportional to 21,511.80, 29,686.32 and 12,080.34

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Solution

The fourth proportional to 21,511.80, 29,686.32 and 12,080.34 is: 16,670.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,511.80 : 29,686.32 = 12,080.34 : x
  2. Step 2: Convert to fraction form
    21,511.80/29,686.32 = 12,080.34/x
  3. Step 3: Cross multiply
    21,511.80x = 29,686.32 × 12,080.34
  4. Step 4: Simplify right side
    21,511.80x = 358,620,838.95
  5. Step 5: Solve for x
    x = 358,620,838.95/21,511.80
  6. Step 6: Final answer
    x = 16,670.89

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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.