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Finding the Fourth Proportional to 74,991, 112,487.60 and 19,587

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Solution

The fourth proportional to 74,991, 112,487.60 and 19,587 is: 29,380.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,991 : 112,487.60 = 19,587 : x
  2. Step 2: Convert to fraction form
    74,991/112,487.60 = 19,587/x
  3. Step 3: Cross multiply
    74,991x = 112,487.60 × 19,587
  4. Step 4: Simplify right side
    74,991x = 2,203,294,621.20
  5. Step 5: Solve for x
    x = 2,203,294,621.20/74,991
  6. Step 6: Final answer
    x = 29,380.79

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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.