Home / 21,294.58-31,909-13,486.98

Finding the Fourth Proportional to 21,294.58, 31,909 and 13,486.98

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Solution

The fourth proportional to 21,294.58, 31,909 and 13,486.98 is: 20,209.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,294.58 : 31,909 = 13,486.98 : x
  2. Step 2: Convert to fraction form
    21,294.58/31,909 = 13,486.98/x
  3. Step 3: Cross multiply
    21,294.58x = 31,909 × 13,486.98
  4. Step 4: Simplify right side
    21,294.58x = 430,356,044.82
  5. Step 5: Solve for x
    x = 430,356,044.82/21,294.58
  6. Step 6: Final answer
    x = 20,209.65

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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.