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Finding the Fourth Proportional to 15,123.51, 20,870.17 and 8,408.99

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Solution

The fourth proportional to 15,123.51, 20,870.17 and 8,408.99 is: 11,604.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,123.51 : 20,870.17 = 8,408.99 : x
  2. Step 2: Convert to fraction form
    15,123.51/20,870.17 = 8,408.99/x
  3. Step 3: Cross multiply
    15,123.51x = 20,870.17 × 8,408.99
  4. Step 4: Simplify right side
    15,123.51x = 175,496,904.43
  5. Step 5: Solve for x
    x = 175,496,904.43/15,123.51
  6. Step 6: Final answer
    x = 11,604.25

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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.