Home / 1,187,054.66-1,638,136.88-643,190.28

Finding the Fourth Proportional to 1,187,054.66, 1,638,136.88 and 643,190.28

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Solution

The fourth proportional to 1,187,054.66, 1,638,136.88 and 643,190.28 is: 887,603.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187,054.66 : 1,638,136.88 = 643,190.28 : x
  2. Step 2: Convert to fraction form
    1,187,054.66/1,638,136.88 = 643,190.28/x
  3. Step 3: Cross multiply
    1,187,054.66x = 1,638,136.88 × 643,190.28
  4. Step 4: Simplify right side
    1,187,054.66x = 1,053,633,720,133.50
  5. Step 5: Solve for x
    x = 1,053,633,720,133.50/1,187,054.66
  6. Step 6: Final answer
    x = 887,603.38

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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.