Home / 21,142-31,703.52-11,278.96

Finding the Fourth Proportional to 21,142, 31,703.52 and 11,278.96

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Solution

The fourth proportional to 21,142, 31,703.52 and 11,278.96 is: 16,913.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,142 : 31,703.52 = 11,278.96 : x
  2. Step 2: Convert to fraction form
    21,142/31,703.52 = 11,278.96/x
  3. Step 3: Cross multiply
    21,142x = 31,703.52 × 11,278.96
  4. Step 4: Simplify right side
    21,142x = 357,582,733.94
  5. Step 5: Solve for x
    x = 357,582,733.94/21,142
  6. Step 6: Final answer
    x = 16,913.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.