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Finding the Fourth Proportional to 12,571.40, 18,878.70 and 8,899.40

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Solution

The fourth proportional to 12,571.40, 18,878.70 and 8,899.40 is: 13,364.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,571.40 : 18,878.70 = 8,899.40 : x
  2. Step 2: Convert to fraction form
    12,571.40/18,878.70 = 8,899.40/x
  3. Step 3: Cross multiply
    12,571.40x = 18,878.70 × 8,899.40
  4. Step 4: Simplify right side
    12,571.40x = 168,009,102.78
  5. Step 5: Solve for x
    x = 168,009,102.78/12,571.40
  6. Step 6: Final answer
    x = 13,364.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.