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Finding the Fourth Proportional to 15,501.54, 21,393 and 8,427.81

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Solution

The fourth proportional to 15,501.54, 21,393 and 8,427.81 is: 11,630.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,501.54 : 21,393 = 8,427.81 : x
  2. Step 2: Convert to fraction form
    15,501.54/21,393 = 8,427.81/x
  3. Step 3: Cross multiply
    15,501.54x = 21,393 × 8,427.81
  4. Step 4: Simplify right side
    15,501.54x = 180,296,139.33
  5. Step 5: Solve for x
    x = 180,296,139.33/15,501.54
  6. Step 6: Final answer
    x = 11,630.85

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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.