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Finding the Fourth Proportional to 15,123.99, 20,871.58 and 8,409.90

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Solution

The fourth proportional to 15,123.99, 20,871.58 and 8,409.90 is: 11,605.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,123.99 : 20,871.58 = 8,409.90 : x
  2. Step 2: Convert to fraction form
    15,123.99/20,871.58 = 8,409.90/x
  3. Step 3: Cross multiply
    15,123.99x = 20,871.58 × 8,409.90
  4. Step 4: Simplify right side
    15,123.99x = 175,527,900.64
  5. Step 5: Solve for x
    x = 175,527,900.64/15,123.99
  6. Step 6: Final answer
    x = 11,605.93

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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.