Home / 21,938.40-30,275.71-12,378.11

Finding the Fourth Proportional to 21,938.40, 30,275.71 and 12,378.11

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Solution

The fourth proportional to 21,938.40, 30,275.71 and 12,378.11 is: 17,082.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,938.40 : 30,275.71 = 12,378.11 : x
  2. Step 2: Convert to fraction form
    21,938.40/30,275.71 = 12,378.11/x
  3. Step 3: Cross multiply
    21,938.40x = 30,275.71 × 12,378.11
  4. Step 4: Simplify right side
    21,938.40x = 374,755,886.38
  5. Step 5: Solve for x
    x = 374,755,886.38/21,938.40
  6. Step 6: Final answer
    x = 17,082.19

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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.