Home / 21,431.84-29,578.56-12,938.80

Finding the Fourth Proportional to 21,431.84, 29,578.56 and 12,938.80

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Solution

The fourth proportional to 21,431.84, 29,578.56 and 12,938.80 is: 17,857.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,431.84 : 29,578.56 = 12,938.80 : x
  2. Step 2: Convert to fraction form
    21,431.84/29,578.56 = 12,938.80/x
  3. Step 3: Cross multiply
    21,431.84x = 29,578.56 × 12,938.80
  4. Step 4: Simplify right side
    21,431.84x = 382,711,072.13
  5. Step 5: Solve for x
    x = 382,711,072.13/21,431.84
  6. Step 6: Final answer
    x = 17,857.13

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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.