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Finding the Fourth Proportional to 10,365.40, 15,515.02 and 8,178.40

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Solution

The fourth proportional to 10,365.40, 15,515.02 and 8,178.40 is: 12,241.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,365.40 : 15,515.02 = 8,178.40 : x
  2. Step 2: Convert to fraction form
    10,365.40/15,515.02 = 8,178.40/x
  3. Step 3: Cross multiply
    10,365.40x = 15,515.02 × 8,178.40
  4. Step 4: Simplify right side
    10,365.40x = 126,888,039.57
  5. Step 5: Solve for x
    x = 126,888,039.57/10,365.40
  6. Step 6: Final answer
    x = 12,241.50

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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.