Home / 21,915.12-30,242.76-11,979.12

Finding the Fourth Proportional to 21,915.12, 30,242.76 and 11,979.12

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Solution

The fourth proportional to 21,915.12, 30,242.76 and 11,979.12 is: 16,531.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.12 : 30,242.76 = 11,979.12 : x
  2. Step 2: Convert to fraction form
    21,915.12/30,242.76 = 11,979.12/x
  3. Step 3: Cross multiply
    21,915.12x = 30,242.76 × 11,979.12
  4. Step 4: Simplify right side
    21,915.12x = 362,281,651.17
  5. Step 5: Solve for x
    x = 362,281,651.17/21,915.12
  6. Step 6: Final answer
    x = 16,531.13

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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.