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Finding the Fourth Proportional to 248,658.72, 343,178.20 and 139,763.21

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Solution

The fourth proportional to 248,658.72, 343,178.20 and 139,763.21 is: 192,889.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    248,658.72 : 343,178.20 = 139,763.21 : x
  2. Step 2: Convert to fraction form
    248,658.72/343,178.20 = 139,763.21/x
  3. Step 3: Cross multiply
    248,658.72x = 343,178.20 × 139,763.21
  4. Step 4: Simplify right side
    248,658.72x = 47,963,684,506.67
  5. Step 5: Solve for x
    x = 47,963,684,506.67/248,658.72
  6. Step 6: Final answer
    x = 192,889.62

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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.