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Finding the Fourth Proportional to 74,659.60, 111,989.40 and 19,255.60

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Solution

The fourth proportional to 74,659.60, 111,989.40 and 19,255.60 is: 28,883.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,659.60 : 111,989.40 = 19,255.60 : x
  2. Step 2: Convert to fraction form
    74,659.60/111,989.40 = 19,255.60/x
  3. Step 3: Cross multiply
    74,659.60x = 111,989.40 × 19,255.60
  4. Step 4: Simplify right side
    74,659.60x = 2,156,423,090.64
  5. Step 5: Solve for x
    x = 2,156,423,090.64/74,659.60
  6. Step 6: Final answer
    x = 28,883.40

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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.