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Finding the Fourth Proportional to 7,916.64, 10,920.20 and 5,227.88

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Solution

The fourth proportional to 7,916.64, 10,920.20 and 5,227.88 is: 7,211.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,916.64 : 10,920.20 = 5,227.88 : x
  2. Step 2: Convert to fraction form
    7,916.64/10,920.20 = 5,227.88/x
  3. Step 3: Cross multiply
    7,916.64x = 10,920.20 × 5,227.88
  4. Step 4: Simplify right side
    7,916.64x = 57,089,558.04
  5. Step 5: Solve for x
    x = 57,089,558.04/7,916.64
  6. Step 6: Final answer
    x = 7,211.34

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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.