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Finding the Fourth Proportional to 18,877.49, 28,328.99 and 7,190.40

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Solution

The fourth proportional to 18,877.49, 28,328.99 and 7,190.40 is: 10,790.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,877.49 : 28,328.99 = 7,190.40 : x
  2. Step 2: Convert to fraction form
    18,877.49/28,328.99 = 7,190.40/x
  3. Step 3: Cross multiply
    18,877.49x = 28,328.99 × 7,190.40
  4. Step 4: Simplify right side
    18,877.49x = 203,696,733.74
  5. Step 5: Solve for x
    x = 203,696,733.74/18,877.49
  6. Step 6: Final answer
    x = 10,790.46

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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.