Home / 21,511.81-29,686.30-12,080.38

Finding the Fourth Proportional to 21,511.81, 29,686.30 and 12,080.38

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Solution

The fourth proportional to 21,511.81, 29,686.30 and 12,080.38 is: 16,670.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,511.81 : 29,686.30 = 12,080.38 : x
  2. Step 2: Convert to fraction form
    21,511.81/29,686.30 = 12,080.38/x
  3. Step 3: Cross multiply
    21,511.81x = 29,686.30 × 12,080.38
  4. Step 4: Simplify right side
    21,511.81x = 358,621,784.79
  5. Step 5: Solve for x
    x = 358,621,784.79/21,511.81
  6. Step 6: Final answer
    x = 16,670.93

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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.