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Finding the Fourth Proportional to 21,690.75, 29,938.71 and 12,264.78

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Solution

The fourth proportional to 21,690.75, 29,938.71 and 12,264.78 is: 16,928.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.75 : 29,938.71 = 12,264.78 : x
  2. Step 2: Convert to fraction form
    21,690.75/29,938.71 = 12,264.78/x
  3. Step 3: Cross multiply
    21,690.75x = 29,938.71 × 12,264.78
  4. Step 4: Simplify right side
    21,690.75x = 367,191,691.63
  5. Step 5: Solve for x
    x = 367,191,691.63/21,690.75
  6. Step 6: Final answer
    x = 16,928.49

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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.