Home / 1,187,191.28-1,638,325.34-643,322.30

Finding the Fourth Proportional to 1,187,191.28, 1,638,325.34 and 643,322.30

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Solution

The fourth proportional to 1,187,191.28, 1,638,325.34 and 643,322.30 is: 887,785.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187,191.28 : 1,638,325.34 = 643,322.30 : x
  2. Step 2: Convert to fraction form
    1,187,191.28/1,638,325.34 = 643,322.30/x
  3. Step 3: Cross multiply
    1,187,191.28x = 1,638,325.34 × 643,322.30
  4. Step 4: Simplify right side
    1,187,191.28x = 1,053,971,231,581.20
  5. Step 5: Solve for x
    x = 1,053,971,231,581.20/1,187,191.28
  6. Step 6: Final answer
    x = 887,785.53

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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.