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Finding the Fourth Proportional to 261,941.40, 392,969.70 and 84,418.20

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Solution

The fourth proportional to 261,941.40, 392,969.70 and 84,418.20 is: 126,645.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,941.40 : 392,969.70 = 84,418.20 : x
  2. Step 2: Convert to fraction form
    261,941.40/392,969.70 = 84,418.20/x
  3. Step 3: Cross multiply
    261,941.40x = 392,969.70 × 84,418.20
  4. Step 4: Simplify right side
    261,941.40x = 33,173,794,728.54
  5. Step 5: Solve for x
    x = 33,173,794,728.54/261,941.40
  6. Step 6: Final answer
    x = 126,645.86

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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.