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Finding the Fourth Proportional to 640,745.34, 961,513.29 and 325,428.54

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Solution

The fourth proportional to 640,745.34, 961,513.29 and 325,428.54 is: 488,343.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,745.34 : 961,513.29 = 325,428.54 : x
  2. Step 2: Convert to fraction form
    640,745.34/961,513.29 = 325,428.54/x
  3. Step 3: Cross multiply
    640,745.34x = 961,513.29 × 325,428.54
  4. Step 4: Simplify right side
    640,745.34x = 312,903,866,155.30
  5. Step 5: Solve for x
    x = 312,903,866,155.30/640,745.34
  6. Step 6: Final answer
    x = 488,343.57

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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.