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Finding the Fourth Proportional to 15,500.79, 21,391.16 and 9,213.21

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Solution

The fourth proportional to 15,500.79, 21,391.16 and 9,213.21 is: 12,714.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,500.79 : 21,391.16 = 9,213.21 : x
  2. Step 2: Convert to fraction form
    15,500.79/21,391.16 = 9,213.21/x
  3. Step 3: Cross multiply
    15,500.79x = 21,391.16 × 9,213.21
  4. Step 4: Simplify right side
    15,500.79x = 197,081,203.16
  5. Step 5: Solve for x
    x = 197,081,203.16/15,500.79
  6. Step 6: Final answer
    x = 12,714.27

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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.