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Finding the Fourth Proportional to 31,015.54, 42,801.72 and 18,437.86

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Solution

The fourth proportional to 31,015.54, 42,801.72 and 18,437.86 is: 25,444.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,015.54 : 42,801.72 = 18,437.86 : x
  2. Step 2: Convert to fraction form
    31,015.54/42,801.72 = 18,437.86/x
  3. Step 3: Cross multiply
    31,015.54x = 42,801.72 × 18,437.86
  4. Step 4: Simplify right side
    31,015.54x = 789,171,907.11
  5. Step 5: Solve for x
    x = 789,171,907.11/31,015.54
  6. Step 6: Final answer
    x = 25,444.41

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.