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Finding the Fourth Proportional to 28,101.60, 42,171.60 and 12,530.40

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Solution

The fourth proportional to 28,101.60, 42,171.60 and 12,530.40 is: 18,804.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,101.60 : 42,171.60 = 12,530.40 : x
  2. Step 2: Convert to fraction form
    28,101.60/42,171.60 = 12,530.40/x
  3. Step 3: Cross multiply
    28,101.60x = 42,171.60 × 12,530.40
  4. Step 4: Simplify right side
    28,101.60x = 528,427,016.64
  5. Step 5: Solve for x
    x = 528,427,016.64/28,101.60
  6. Step 6: Final answer
    x = 18,804.16

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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.