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Finding the Fourth Proportional to 15,390, 21,238.20 and 8,674.97

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Solution

The fourth proportional to 15,390, 21,238.20 and 8,674.97 is: 11,971.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,390 : 21,238.20 = 8,674.97 : x
  2. Step 2: Convert to fraction form
    15,390/21,238.20 = 8,674.97/x
  3. Step 3: Cross multiply
    15,390x = 21,238.20 × 8,674.97
  4. Step 4: Simplify right side
    15,390x = 184,240,641.66
  5. Step 5: Solve for x
    x = 184,240,641.66/15,390
  6. Step 6: Final answer
    x = 11,971.45

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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.