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Finding the Fourth Proportional to 15,157.89, 20,916.23 and 8,442.99

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Solution

The fourth proportional to 15,157.89, 20,916.23 and 8,442.99 is: 11,650.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,157.89 : 20,916.23 = 8,442.99 : x
  2. Step 2: Convert to fraction form
    15,157.89/20,916.23 = 8,442.99/x
  3. Step 3: Cross multiply
    15,157.89x = 20,916.23 × 8,442.99
  4. Step 4: Simplify right side
    15,157.89x = 176,595,478.51
  5. Step 5: Solve for x
    x = 176,595,478.51/15,157.89
  6. Step 6: Final answer
    x = 11,650.40

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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.