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Finding the Fourth Proportional to 74,656.60, 111,984.90 and 74,138.20

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Solution

The fourth proportional to 74,656.60, 111,984.90 and 74,138.20 is: 111,207.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,656.60 : 111,984.90 = 74,138.20 : x
  2. Step 2: Convert to fraction form
    74,656.60/111,984.90 = 74,138.20/x
  3. Step 3: Cross multiply
    74,656.60x = 111,984.90 × 74,138.20
  4. Step 4: Simplify right side
    74,656.60x = 8,302,358,913.18
  5. Step 5: Solve for x
    x = 8,302,358,913.18/74,656.60
  6. Step 6: Final answer
    x = 111,207.30

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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.