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Finding the Fourth Proportional to 318,124.78, 439,020.60 and 172,940.34

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Solution

The fourth proportional to 318,124.78, 439,020.60 and 172,940.34 is: 238,662.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,124.78 : 439,020.60 = 172,940.34 : x
  2. Step 2: Convert to fraction form
    318,124.78/439,020.60 = 172,940.34/x
  3. Step 3: Cross multiply
    318,124.78x = 439,020.60 × 172,940.34
  4. Step 4: Simplify right side
    318,124.78x = 75,924,371,831.00
  5. Step 5: Solve for x
    x = 75,924,371,831.00/318,124.78
  6. Step 6: Final answer
    x = 238,662.24

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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.