Home / 1,186,990.82-1,638,041.37-643,122.80

Finding the Fourth Proportional to 1,186,990.82, 1,638,041.37 and 643,122.80

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Solution

The fourth proportional to 1,186,990.82, 1,638,041.37 and 643,122.80 is: 887,506.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186,990.82 : 1,638,041.37 = 643,122.80 : x
  2. Step 2: Convert to fraction form
    1,186,990.82/1,638,041.37 = 643,122.80/x
  3. Step 3: Cross multiply
    1,186,990.82x = 1,638,041.37 × 643,122.80
  4. Step 4: Simplify right side
    1,186,990.82x = 1,053,461,752,390.24
  5. Step 5: Solve for x
    x = 1,053,461,752,390.24/1,186,990.82
  6. Step 6: Final answer
    x = 887,506.23

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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.