Home / 21,678.85-29,916.18-12,118.75

Finding the Fourth Proportional to 21,678.85, 29,916.18 and 12,118.75

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Solution

The fourth proportional to 21,678.85, 29,916.18 and 12,118.75 is: 16,723.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,678.85 : 29,916.18 = 12,118.75 : x
  2. Step 2: Convert to fraction form
    21,678.85/29,916.18 = 12,118.75/x
  3. Step 3: Cross multiply
    21,678.85x = 29,916.18 × 12,118.75
  4. Step 4: Simplify right side
    21,678.85x = 362,546,706.38
  5. Step 5: Solve for x
    x = 362,546,706.38/21,678.85
  6. Step 6: Final answer
    x = 16,723.52

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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.