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Finding the Fourth Proportional to 18,921.70, 28,382.55 and 4,881.70

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Solution

The fourth proportional to 18,921.70, 28,382.55 and 4,881.70 is: 7,322.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.70 : 28,382.55 = 4,881.70 : x
  2. Step 2: Convert to fraction form
    18,921.70/28,382.55 = 4,881.70/x
  3. Step 3: Cross multiply
    18,921.70x = 28,382.55 × 4,881.70
  4. Step 4: Simplify right side
    18,921.70x = 138,555,094.34
  5. Step 5: Solve for x
    x = 138,555,094.34/18,921.70
  6. Step 6: Final answer
    x = 7,322.55

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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.