Home / 21,930.50-30,269.49-13,431.08

Finding the Fourth Proportional to 21,930.50, 30,269.49 and 13,431.08

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Solution

The fourth proportional to 21,930.50, 30,269.49 and 13,431.08 is: 18,538.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,930.50 : 30,269.49 = 13,431.08 : x
  2. Step 2: Convert to fraction form
    21,930.50/30,269.49 = 13,431.08/x
  3. Step 3: Cross multiply
    21,930.50x = 30,269.49 × 13,431.08
  4. Step 4: Simplify right side
    21,930.50x = 406,551,941.75
  5. Step 5: Solve for x
    x = 406,551,941.75/21,930.50
  6. Step 6: Final answer
    x = 18,538.20

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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.