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Finding the Fourth Proportional to 620,690.40, 856,339.56 and 403,170.84

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Solution

The fourth proportional to 620,690.40, 856,339.56 and 403,170.84 is: 556,237.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,690.40 : 856,339.56 = 403,170.84 : x
  2. Step 2: Convert to fraction form
    620,690.40/856,339.56 = 403,170.84/x
  3. Step 3: Cross multiply
    620,690.40x = 856,339.56 × 403,170.84
  4. Step 4: Simplify right side
    620,690.40x = 345,251,139,730.43
  5. Step 5: Solve for x
    x = 345,251,139,730.43/620,690.40
  6. Step 6: Final answer
    x = 556,237.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.