Home / 1,187,143.83-1,638,288.60-728,511.72

Finding the Fourth Proportional to 1,187,143.83, 1,638,288.60 and 728,511.72

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Solution

The fourth proportional to 1,187,143.83, 1,638,288.60 and 728,511.72 is: 1,005,364.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187,143.83 : 1,638,288.60 = 728,511.72 : x
  2. Step 2: Convert to fraction form
    1,187,143.83/1,638,288.60 = 728,511.72/x
  3. Step 3: Cross multiply
    1,187,143.83x = 1,638,288.60 × 728,511.72
  4. Step 4: Simplify right side
    1,187,143.83x = 1,193,512,445,842.39
  5. Step 5: Solve for x
    x = 1,193,512,445,842.39/1,187,143.83
  6. Step 6: Final answer
    x = 1,005,364.65

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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.