Home / 21,511.63-29,686.40-12,079.99

Finding the Fourth Proportional to 21,511.63, 29,686.40 and 12,079.99

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Solution

The fourth proportional to 21,511.63, 29,686.40 and 12,079.99 is: 16,670.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,511.63 : 29,686.40 = 12,079.99 : x
  2. Step 2: Convert to fraction form
    21,511.63/29,686.40 = 12,079.99/x
  3. Step 3: Cross multiply
    21,511.63x = 29,686.40 × 12,079.99
  4. Step 4: Simplify right side
    21,511.63x = 358,611,415.14
  5. Step 5: Solve for x
    x = 358,611,415.14/21,511.63
  6. Step 6: Final answer
    x = 16,670.58

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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.