Home / 21,120.08-29,145.60-11,688.32

Finding the Fourth Proportional to 21,120.08, 29,145.60 and 11,688.32

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Solution

The fourth proportional to 21,120.08, 29,145.60 and 11,688.32 is: 16,129.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.08 : 29,145.60 = 11,688.32 : x
  2. Step 2: Convert to fraction form
    21,120.08/29,145.60 = 11,688.32/x
  3. Step 3: Cross multiply
    21,120.08x = 29,145.60 × 11,688.32
  4. Step 4: Simplify right side
    21,120.08x = 340,663,099.39
  5. Step 5: Solve for x
    x = 340,663,099.39/21,120.08
  6. Step 6: Final answer
    x = 16,129.82

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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.