Home / 20,916.50-31,341.30-18,792.12

Finding the Fourth Proportional to 20,916.50, 31,341.30 and 18,792.12

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Solution

The fourth proportional to 20,916.50, 31,341.30 and 18,792.12 is: 28,158.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916.50 : 31,341.30 = 18,792.12 : x
  2. Step 2: Convert to fraction form
    20,916.50/31,341.30 = 18,792.12/x
  3. Step 3: Cross multiply
    20,916.50x = 31,341.30 × 18,792.12
  4. Step 4: Simplify right side
    20,916.50x = 588,969,219.89
  5. Step 5: Solve for x
    x = 588,969,219.89/20,916.50
  6. Step 6: Final answer
    x = 28,158.12

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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.