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Finding the Fourth Proportional to 326,868.60, 490,498.74 and 139,880.28

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Solution

The fourth proportional to 326,868.60, 490,498.74 and 139,880.28 is: 209,904.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,868.60 : 490,498.74 = 139,880.28 : x
  2. Step 2: Convert to fraction form
    326,868.60/490,498.74 = 139,880.28/x
  3. Step 3: Cross multiply
    326,868.60x = 490,498.74 × 139,880.28
  4. Step 4: Simplify right side
    326,868.60x = 68,611,101,090.85
  5. Step 5: Solve for x
    x = 68,611,101,090.85/326,868.60
  6. Step 6: Final answer
    x = 209,904.23

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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.