Home / 21,647.66-29,868.95-12,691.89

Finding the Fourth Proportional to 21,647.66, 29,868.95 and 12,691.89

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Solution

The fourth proportional to 21,647.66, 29,868.95 and 12,691.89 is: 17,511.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,647.66 : 29,868.95 = 12,691.89 : x
  2. Step 2: Convert to fraction form
    21,647.66/29,868.95 = 12,691.89/x
  3. Step 3: Cross multiply
    21,647.66x = 29,868.95 × 12,691.89
  4. Step 4: Simplify right side
    21,647.66x = 379,093,459.55
  5. Step 5: Solve for x
    x = 379,093,459.55/21,647.66
  6. Step 6: Final answer
    x = 17,511.99

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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.