Home / 21,479.42-29,640.66-12,983.60

Finding the Fourth Proportional to 21,479.42, 29,640.66 and 12,983.60

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Solution

The fourth proportional to 21,479.42, 29,640.66 and 12,983.60 is: 17,916.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,479.42 : 29,640.66 = 12,983.60 : x
  2. Step 2: Convert to fraction form
    21,479.42/29,640.66 = 12,983.60/x
  3. Step 3: Cross multiply
    21,479.42x = 29,640.66 × 12,983.60
  4. Step 4: Simplify right side
    21,479.42x = 384,842,473.18
  5. Step 5: Solve for x
    x = 384,842,473.18/21,479.42
  6. Step 6: Final answer
    x = 17,916.80

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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.