Home / 20,640.81-28,486.75-12,257.31

Finding the Fourth Proportional to 20,640.81, 28,486.75 and 12,257.31

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Solution

The fourth proportional to 20,640.81, 28,486.75 and 12,257.31 is: 16,916.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.81 : 28,486.75 = 12,257.31 : x
  2. Step 2: Convert to fraction form
    20,640.81/28,486.75 = 12,257.31/x
  3. Step 3: Cross multiply
    20,640.81x = 28,486.75 × 12,257.31
  4. Step 4: Simplify right side
    20,640.81x = 349,170,925.64
  5. Step 5: Solve for x
    x = 349,170,925.64/20,640.81
  6. Step 6: Final answer
    x = 16,916.53

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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.