Home / 20,985.53-28,950.84-13,806.21

Finding the Fourth Proportional to 20,985.53, 28,950.84 and 13,806.21

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Solution

The fourth proportional to 20,985.53, 28,950.84 and 13,806.21 is: 19,046.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.53 : 28,950.84 = 13,806.21 : x
  2. Step 2: Convert to fraction form
    20,985.53/28,950.84 = 13,806.21/x
  3. Step 3: Cross multiply
    20,985.53x = 28,950.84 × 13,806.21
  4. Step 4: Simplify right side
    20,985.53x = 399,701,524.11
  5. Step 5: Solve for x
    x = 399,701,524.11/20,985.53
  6. Step 6: Final answer
    x = 19,046.53

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1.5x scale

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.