Home / 31,421.17-47,126.89-20,405.98

Finding the Fourth Proportional to 31,421.17, 47,126.89 and 20,405.98

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Solution

The fourth proportional to 31,421.17, 47,126.89 and 20,405.98 is: 30,605.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,421.17 : 47,126.89 = 20,405.98 : x
  2. Step 2: Convert to fraction form
    31,421.17/47,126.89 = 20,405.98/x
  3. Step 3: Cross multiply
    31,421.17x = 47,126.89 × 20,405.98
  4. Step 4: Simplify right side
    31,421.17x = 961,670,374.80
  5. Step 5: Solve for x
    x = 961,670,374.80/31,421.17
  6. Step 6: Final answer
    x = 30,605.81

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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.