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Finding the Fourth Proportional to 15,409.50, 21,265.11 and 8,785.50

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Solution

The fourth proportional to 15,409.50, 21,265.11 and 8,785.50 is: 12,123.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,409.50 : 21,265.11 = 8,785.50 : x
  2. Step 2: Convert to fraction form
    15,409.50/21,265.11 = 8,785.50/x
  3. Step 3: Cross multiply
    15,409.50x = 21,265.11 × 8,785.50
  4. Step 4: Simplify right side
    15,409.50x = 186,824,623.91
  5. Step 5: Solve for x
    x = 186,824,623.91/15,409.50
  6. Step 6: Final answer
    x = 12,123.99

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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.