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Finding the Fourth Proportional to 262,603.40, 393,953.70 and 85,116.20

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Solution

The fourth proportional to 262,603.40, 393,953.70 and 85,116.20 is: 127,690.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    262,603.40 : 393,953.70 = 85,116.20 : x
  2. Step 2: Convert to fraction form
    262,603.40/393,953.70 = 85,116.20/x
  3. Step 3: Cross multiply
    262,603.40x = 393,953.70 × 85,116.20
  4. Step 4: Simplify right side
    262,603.40x = 33,531,841,919.94
  5. Step 5: Solve for x
    x = 33,531,841,919.94/262,603.40
  6. Step 6: Final answer
    x = 127,690.05

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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.