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Finding the Fourth Proportional to 15,509.88, 21,407.42 and 8,799.44

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Solution

The fourth proportional to 15,509.88, 21,407.42 and 8,799.44 is: 12,145.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,509.88 : 21,407.42 = 8,799.44 : x
  2. Step 2: Convert to fraction form
    15,509.88/21,407.42 = 8,799.44/x
  3. Step 3: Cross multiply
    15,509.88x = 21,407.42 × 8,799.44
  4. Step 4: Simplify right side
    15,509.88x = 188,373,222.81
  5. Step 5: Solve for x
    x = 188,373,222.81/15,509.88
  6. Step 6: Final answer
    x = 12,145.37

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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.