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Finding the Fourth Proportional to 15,805.74, 21,810.06 and 8,731.74

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Solution

The fourth proportional to 15,805.74, 21,810.06 and 8,731.74 is: 12,048.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,805.74 : 21,810.06 = 8,731.74 : x
  2. Step 2: Convert to fraction form
    15,805.74/21,810.06 = 8,731.74/x
  3. Step 3: Cross multiply
    15,805.74x = 21,810.06 × 8,731.74
  4. Step 4: Simplify right side
    15,805.74x = 190,439,827.83
  5. Step 5: Solve for x
    x = 190,439,827.83/15,805.74
  6. Step 6: Final answer
    x = 12,048.77

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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.