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Finding the Fourth Proportional to 74,095, 111,142.50 and 18,691

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Solution

The fourth proportional to 74,095, 111,142.50 and 18,691 is: 28,036.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,095 : 111,142.50 = 18,691 : x
  2. Step 2: Convert to fraction form
    74,095/111,142.50 = 18,691/x
  3. Step 3: Cross multiply
    74,095x = 111,142.50 × 18,691
  4. Step 4: Simplify right side
    74,095x = 2,077,364,467.50
  5. Step 5: Solve for x
    x = 2,077,364,467.50/74,095
  6. Step 6: Final answer
    x = 28,036.50

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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.