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Finding the Fourth Proportional to 15,298.65, 21,108.54 and 8,921.43

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Solution

The fourth proportional to 15,298.65, 21,108.54 and 8,921.43 is: 12,309.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,298.65 : 21,108.54 = 8,921.43 : x
  2. Step 2: Convert to fraction form
    15,298.65/21,108.54 = 8,921.43/x
  3. Step 3: Cross multiply
    15,298.65x = 21,108.54 × 8,921.43
  4. Step 4: Simplify right side
    15,298.65x = 188,318,362.01
  5. Step 5: Solve for x
    x = 188,318,362.01/15,298.65
  6. Step 6: Final answer
    x = 12,309.48

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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.