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Finding the Fourth Proportional to 74,911.64, 112,368 and 18,752.72

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Solution

The fourth proportional to 74,911.64, 112,368 and 18,752.72 is: 28,129.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,911.64 : 112,368 = 18,752.72 : x
  2. Step 2: Convert to fraction form
    74,911.64/112,368 = 18,752.72/x
  3. Step 3: Cross multiply
    74,911.64x = 112,368 × 18,752.72
  4. Step 4: Simplify right side
    74,911.64x = 2,107,205,640.96
  5. Step 5: Solve for x
    x = 2,107,205,640.96/74,911.64
  6. Step 6: Final answer
    x = 28,129.22

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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.