Home / 21,431.59-29,578.23-12,938.57

Finding the Fourth Proportional to 21,431.59, 29,578.23 and 12,938.57

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Solution

The fourth proportional to 21,431.59, 29,578.23 and 12,938.57 is: 17,856.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,431.59 : 29,578.23 = 12,938.57 : x
  2. Step 2: Convert to fraction form
    21,431.59/29,578.23 = 12,938.57/x
  3. Step 3: Cross multiply
    21,431.59x = 29,578.23 × 12,938.57
  4. Step 4: Simplify right side
    21,431.59x = 382,699,962.36
  5. Step 5: Solve for x
    x = 382,699,962.36/21,431.59
  6. Step 6: Final answer
    x = 17,856.82

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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.