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Finding the Fourth Proportional to 168,300, 252,079.20 and 139,117.32

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Solution

The fourth proportional to 168,300, 252,079.20 and 139,117.32 is: 208,369.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    168,300 : 252,079.20 = 139,117.32 : x
  2. Step 2: Convert to fraction form
    168,300/252,079.20 = 139,117.32/x
  3. Step 3: Cross multiply
    168,300x = 252,079.20 × 139,117.32
  4. Step 4: Simplify right side
    168,300x = 35,068,582,731.74
  5. Step 5: Solve for x
    x = 35,068,582,731.74/168,300
  6. Step 6: Final answer
    x = 208,369.48

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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.