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Finding the Fourth Proportional to 261,638.20, 392,918.10 and 253,343.80

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Solution

The fourth proportional to 261,638.20, 392,918.10 and 253,343.80 is: 380,461.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,638.20 : 392,918.10 = 253,343.80 : x
  2. Step 2: Convert to fraction form
    261,638.20/392,918.10 = 253,343.80/x
  3. Step 3: Cross multiply
    261,638.20x = 392,918.10 × 253,343.80
  4. Step 4: Simplify right side
    261,638.20x = 99,543,364,542.78
  5. Step 5: Solve for x
    x = 99,543,364,542.78/261,638.20
  6. Step 6: Final answer
    x = 380,461.89

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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.