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Finding the Fourth Proportional to 271,340.80, 407,011.20 and 138,630.40

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Solution

The fourth proportional to 271,340.80, 407,011.20 and 138,630.40 is: 207,945.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    271,340.80 : 407,011.20 = 138,630.40 : x
  2. Step 2: Convert to fraction form
    271,340.80/407,011.20 = 138,630.40/x
  3. Step 3: Cross multiply
    271,340.80x = 407,011.20 × 138,630.40
  4. Step 4: Simplify right side
    271,340.80x = 56,424,125,460.48
  5. Step 5: Solve for x
    x = 56,424,125,460.48/271,340.80
  6. Step 6: Final answer
    x = 207,945.60

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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.