Home / 20,916.78-31,379.02-6,877.60

Finding the Fourth Proportional to 20,916.78, 31,379.02 and 6,877.60

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Solution

The fourth proportional to 20,916.78, 31,379.02 and 6,877.60 is: 10,317.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916.78 : 31,379.02 = 6,877.60 : x
  2. Step 2: Convert to fraction form
    20,916.78/31,379.02 = 6,877.60/x
  3. Step 3: Cross multiply
    20,916.78x = 31,379.02 × 6,877.60
  4. Step 4: Simplify right side
    20,916.78x = 215,812,347.95
  5. Step 5: Solve for x
    x = 215,812,347.95/20,916.78
  6. Step 6: Final answer
    x = 10,317.67

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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.