Home / 20,968.79-31,404.57-12,630.59

Finding the Fourth Proportional to 20,968.79, 31,404.57 and 12,630.59

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Solution

The fourth proportional to 20,968.79, 31,404.57 and 12,630.59 is: 18,916.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,968.79 : 31,404.57 = 12,630.59 : x
  2. Step 2: Convert to fraction form
    20,968.79/31,404.57 = 12,630.59/x
  3. Step 3: Cross multiply
    20,968.79x = 31,404.57 × 12,630.59
  4. Step 4: Simplify right side
    20,968.79x = 396,658,090.77
  5. Step 5: Solve for x
    x = 396,658,090.77/20,968.79
  6. Step 6: Final answer
    x = 18,916.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.