Home / 21,317.91-29,415.28-12,818

Finding the Fourth Proportional to 21,317.91, 29,415.28 and 12,818

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Solution

The fourth proportional to 21,317.91, 29,415.28 and 12,818 is: 17,686.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,317.91 : 29,415.28 = 12,818 : x
  2. Step 2: Convert to fraction form
    21,317.91/29,415.28 = 12,818/x
  3. Step 3: Cross multiply
    21,317.91x = 29,415.28 × 12,818
  4. Step 4: Simplify right side
    21,317.91x = 377,045,059.04
  5. Step 5: Solve for x
    x = 377,045,059.04/21,317.91
  6. Step 6: Final answer
    x = 17,686.77

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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.