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Finding the Fourth Proportional to 1,187,600.80, 1,638,858 and 643,712.80

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Solution

The fourth proportional to 1,187,600.80, 1,638,858 and 643,712.80 is: 888,306.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187,600.80 : 1,638,858 = 643,712.80 : x
  2. Step 2: Convert to fraction form
    1,187,600.80/1,638,858 = 643,712.80/x
  3. Step 3: Cross multiply
    1,187,600.80x = 1,638,858 × 643,712.80
  4. Step 4: Simplify right side
    1,187,600.80x = 1,054,953,871,982.40
  5. Step 5: Solve for x
    x = 1,054,953,871,982.40/1,187,600.80
  6. Step 6: Final answer
    x = 888,306.80

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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.