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Finding the Fourth Proportional to 15,225.31, 21,015.08 and 8,939.71

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Solution

The fourth proportional to 15,225.31, 21,015.08 and 8,939.71 is: 12,339.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,225.31 : 21,015.08 = 8,939.71 : x
  2. Step 2: Convert to fraction form
    15,225.31/21,015.08 = 8,939.71/x
  3. Step 3: Cross multiply
    15,225.31x = 21,015.08 × 8,939.71
  4. Step 4: Simplify right side
    15,225.31x = 187,868,720.83
  5. Step 5: Solve for x
    x = 187,868,720.83/15,225.31
  6. Step 6: Final answer
    x = 12,339.24

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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.