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Finding the Fourth Proportional to 15,661.98, 21,612.51 and 8,586.99

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Solution

The fourth proportional to 15,661.98, 21,612.51 and 8,586.99 is: 11,849.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,661.98 : 21,612.51 = 8,586.99 : x
  2. Step 2: Convert to fraction form
    15,661.98/21,612.51 = 8,586.99/x
  3. Step 3: Cross multiply
    15,661.98x = 21,612.51 × 8,586.99
  4. Step 4: Simplify right side
    15,661.98x = 185,586,407.24
  5. Step 5: Solve for x
    x = 185,586,407.24/15,661.98
  6. Step 6: Final answer
    x = 11,849.49

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Double scale
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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.