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Finding the Fourth Proportional to 620,135.70, 930,203.55 and 578,145.30

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Solution

The fourth proportional to 620,135.70, 930,203.55 and 578,145.30 is: 867,217.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,135.70 : 930,203.55 = 578,145.30 : x
  2. Step 2: Convert to fraction form
    620,135.70/930,203.55 = 578,145.30/x
  3. Step 3: Cross multiply
    620,135.70x = 930,203.55 × 578,145.30
  4. Step 4: Simplify right side
    620,135.70x = 537,792,810,475.82
  5. Step 5: Solve for x
    x = 537,792,810,475.82/620,135.70
  6. Step 6: Final answer
    x = 867,217.95

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Double scale
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Similar ratio
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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.