Home / 21,890.24-30,202-12,938.56

Finding the Fourth Proportional to 21,890.24, 30,202 and 12,938.56

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Solution

The fourth proportional to 21,890.24, 30,202 and 12,938.56 is: 17,851.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,890.24 : 30,202 = 12,938.56 : x
  2. Step 2: Convert to fraction form
    21,890.24/30,202 = 12,938.56/x
  3. Step 3: Cross multiply
    21,890.24x = 30,202 × 12,938.56
  4. Step 4: Simplify right side
    21,890.24x = 390,770,389.12
  5. Step 5: Solve for x
    x = 390,770,389.12/21,890.24
  6. Step 6: Final answer
    x = 17,851.35

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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.