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Finding the Fourth Proportional to 18,753.40, 28,116.16 and 11,356.12

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Solution

The fourth proportional to 18,753.40, 28,116.16 and 11,356.12 is: 17,025.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,753.40 : 28,116.16 = 11,356.12 : x
  2. Step 2: Convert to fraction form
    18,753.40/28,116.16 = 11,356.12/x
  3. Step 3: Cross multiply
    18,753.40x = 28,116.16 × 11,356.12
  4. Step 4: Simplify right side
    18,753.40x = 319,290,486.90
  5. Step 5: Solve for x
    x = 319,290,486.90/18,753.40
  6. Step 6: Final answer
    x = 17,025.74

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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.