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Finding the Fourth Proportional to 15,558.71, 21,470.81 and 8,485.13

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Solution

The fourth proportional to 15,558.71, 21,470.81 and 8,485.13 is: 11,709.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,558.71 : 21,470.81 = 8,485.13 : x
  2. Step 2: Convert to fraction form
    15,558.71/21,470.81 = 8,485.13/x
  3. Step 3: Cross multiply
    15,558.71x = 21,470.81 × 8,485.13
  4. Step 4: Simplify right side
    15,558.71x = 182,182,571.63
  5. Step 5: Solve for x
    x = 182,182,571.63/15,558.71
  6. Step 6: Final answer
    x = 11,709.36

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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.