Home / 20,970.49-31,396.88-15,729.89

Finding the Fourth Proportional to 20,970.49, 31,396.88 and 15,729.89

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Solution

The fourth proportional to 20,970.49, 31,396.88 and 15,729.89 is: 23,550.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.49 : 31,396.88 = 15,729.89 : x
  2. Step 2: Convert to fraction form
    20,970.49/31,396.88 = 15,729.89/x
  3. Step 3: Cross multiply
    20,970.49x = 31,396.88 × 15,729.89
  4. Step 4: Simplify right side
    20,970.49x = 493,869,468.74
  5. Step 5: Solve for x
    x = 493,869,468.74/20,970.49
  6. Step 6: Final answer
    x = 23,550.69

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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.