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Finding the Fourth Proportional to 18,978.53, 28,485.07 and 10,101.31

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Solution

The fourth proportional to 18,978.53, 28,485.07 and 10,101.31 is: 15,161.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.53 : 28,485.07 = 10,101.31 : x
  2. Step 2: Convert to fraction form
    18,978.53/28,485.07 = 10,101.31/x
  3. Step 3: Cross multiply
    18,978.53x = 28,485.07 × 10,101.31
  4. Step 4: Simplify right side
    18,978.53x = 287,736,460.45
  5. Step 5: Solve for x
    x = 287,736,460.45/18,978.53
  6. Step 6: Final answer
    x = 15,161.16

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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.