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Finding the Fourth Proportional to 21,181.45, 31,733.45 and 9,916.12

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Solution

The fourth proportional to 21,181.45, 31,733.45 and 9,916.12 is: 14,856.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,181.45 : 31,733.45 = 9,916.12 : x
  2. Step 2: Convert to fraction form
    21,181.45/31,733.45 = 9,916.12/x
  3. Step 3: Cross multiply
    21,181.45x = 31,733.45 × 9,916.12
  4. Step 4: Simplify right side
    21,181.45x = 314,672,697.60
  5. Step 5: Solve for x
    x = 314,672,697.60/21,181.45
  6. Step 6: Final answer
    x = 14,856.05

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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.