Home / 721,111.31-1,081,371.72-321,478.75

Finding the Fourth Proportional to 721,111.31, 1,081,371.72 and 321,478.75

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Solution

The fourth proportional to 721,111.31, 1,081,371.72 and 321,478.75 is: 482,086.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,111.31 : 1,081,371.72 = 321,478.75 : x
  2. Step 2: Convert to fraction form
    721,111.31/1,081,371.72 = 321,478.75/x
  3. Step 3: Cross multiply
    721,111.31x = 1,081,371.72 × 321,478.75
  4. Step 4: Simplify right side
    721,111.31x = 347,638,026,538.53
  5. Step 5: Solve for x
    x = 347,638,026,538.53/721,111.31
  6. Step 6: Final answer
    x = 482,086.50

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.