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Finding the Fourth Proportional to 620,651.80, 930,977.70 and 578,661.40

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Solution

The fourth proportional to 620,651.80, 930,977.70 and 578,661.40 is: 867,992.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,651.80 : 930,977.70 = 578,661.40 : x
  2. Step 2: Convert to fraction form
    620,651.80/930,977.70 = 578,661.40/x
  3. Step 3: Cross multiply
    620,651.80x = 930,977.70 × 578,661.40
  4. Step 4: Simplify right side
    620,651.80x = 538,720,859,250.78
  5. Step 5: Solve for x
    x = 538,720,859,250.78/620,651.80
  6. Step 6: Final answer
    x = 867,992.10

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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.