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Finding the Fourth Proportional to 15,645.78, 21,595.70 and 8,935.07

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Solution

The fourth proportional to 15,645.78, 21,595.70 and 8,935.07 is: 12,332.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,645.78 : 21,595.70 = 8,935.07 : x
  2. Step 2: Convert to fraction form
    15,645.78/21,595.70 = 8,935.07/x
  3. Step 3: Cross multiply
    15,645.78x = 21,595.70 × 8,935.07
  4. Step 4: Simplify right side
    15,645.78x = 192,959,005.56
  5. Step 5: Solve for x
    x = 192,959,005.56/15,645.78
  6. Step 6: Final answer
    x = 12,332.97

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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.