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Finding the Fourth Proportional to 15,459.15, 21,333.05 and 8,385.42

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Solution

The fourth proportional to 15,459.15, 21,333.05 and 8,385.42 is: 11,571.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,459.15 : 21,333.05 = 8,385.42 : x
  2. Step 2: Convert to fraction form
    15,459.15/21,333.05 = 8,385.42/x
  3. Step 3: Cross multiply
    15,459.15x = 21,333.05 × 8,385.42
  4. Step 4: Simplify right side
    15,459.15x = 178,886,584.13
  5. Step 5: Solve for x
    x = 178,886,584.13/15,459.15
  6. Step 6: Final answer
    x = 11,571.57

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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.