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Finding the Fourth Proportional to 18,820.54, 28,230.78 and 10,386.64

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Solution

The fourth proportional to 18,820.54, 28,230.78 and 10,386.64 is: 15,579.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,820.54 : 28,230.78 = 10,386.64 : x
  2. Step 2: Convert to fraction form
    18,820.54/28,230.78 = 10,386.64/x
  3. Step 3: Cross multiply
    18,820.54x = 28,230.78 × 10,386.64
  4. Step 4: Simplify right side
    18,820.54x = 293,222,948.78
  5. Step 5: Solve for x
    x = 293,222,948.78/18,820.54
  6. Step 6: Final answer
    x = 15,579.94

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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.