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Finding the Fourth Proportional to 79,615.44, 109,911.60 and 61,670.16

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Solution

The fourth proportional to 79,615.44, 109,911.60 and 61,670.16 is: 85,137.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,615.44 : 109,911.60 = 61,670.16 : x
  2. Step 2: Convert to fraction form
    79,615.44/109,911.60 = 61,670.16/x
  3. Step 3: Cross multiply
    79,615.44x = 109,911.60 × 61,670.16
  4. Step 4: Simplify right side
    79,615.44x = 6,778,265,957.86
  5. Step 5: Solve for x
    x = 6,778,265,957.86/79,615.44
  6. Step 6: Final answer
    x = 85,137.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.