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Finding the Fourth Proportional to 261,960.20, 392,940.30 and 72,420.20

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Solution

The fourth proportional to 261,960.20, 392,940.30 and 72,420.20 is: 108,630.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,960.20 : 392,940.30 = 72,420.20 : x
  2. Step 2: Convert to fraction form
    261,960.20/392,940.30 = 72,420.20/x
  3. Step 3: Cross multiply
    261,960.20x = 392,940.30 × 72,420.20
  4. Step 4: Simplify right side
    261,960.20x = 28,456,815,114.06
  5. Step 5: Solve for x
    x = 28,456,815,114.06/261,960.20
  6. Step 6: Final answer
    x = 108,630.30

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1.5x scale

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.