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Finding the Fourth Proportional to 262,403.20, 393,604.80 and 209,915.20

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Solution

The fourth proportional to 262,403.20, 393,604.80 and 209,915.20 is: 314,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    262,403.20 : 393,604.80 = 209,915.20 : x
  2. Step 2: Convert to fraction form
    262,403.20/393,604.80 = 209,915.20/x
  3. Step 3: Cross multiply
    262,403.20x = 393,604.80 × 209,915.20
  4. Step 4: Simplify right side
    262,403.20x = 82,623,630,312.96
  5. Step 5: Solve for x
    x = 82,623,630,312.96/262,403.20
  6. Step 6: Final answer
    x = 314,872.80

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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.