Home / 1,187,108.40-1,638,192.72-643,231.44

Finding the Fourth Proportional to 1,187,108.40, 1,638,192.72 and 643,231.44

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Solution

The fourth proportional to 1,187,108.40, 1,638,192.72 and 643,231.44 is: 887,650.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187,108.40 : 1,638,192.72 = 643,231.44 : x
  2. Step 2: Convert to fraction form
    1,187,108.40/1,638,192.72 = 643,231.44/x
  3. Step 3: Cross multiply
    1,187,108.40x = 1,638,192.72 × 643,231.44
  4. Step 4: Simplify right side
    1,187,108.40x = 1,053,737,062,283.12
  5. Step 5: Solve for x
    x = 1,053,737,062,283.12/1,187,108.40
  6. Step 6: Final answer
    x = 887,650.25

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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.