Home / 20,916.78-31,190.66-18,013.74

Finding the Fourth Proportional to 20,916.78, 31,190.66 and 18,013.74

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Solution

The fourth proportional to 20,916.78, 31,190.66 and 18,013.74 is: 26,861.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916.78 : 31,190.66 = 18,013.74 : x
  2. Step 2: Convert to fraction form
    20,916.78/31,190.66 = 18,013.74/x
  3. Step 3: Cross multiply
    20,916.78x = 31,190.66 × 18,013.74
  4. Step 4: Simplify right side
    20,916.78x = 561,860,349.60
  5. Step 5: Solve for x
    x = 561,860,349.60/20,916.78
  6. Step 6: Final answer
    x = 26,861.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.