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Finding the Fourth Proportional to 641,617.68, 885,339.72 and 355,137.06

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Solution

The fourth proportional to 641,617.68, 885,339.72 and 355,137.06 is: 490,037.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,617.68 : 885,339.72 = 355,137.06 : x
  2. Step 2: Convert to fraction form
    641,617.68/885,339.72 = 355,137.06/x
  3. Step 3: Cross multiply
    641,617.68x = 885,339.72 × 355,137.06
  4. Step 4: Simplify right side
    641,617.68x = 314,416,945,262.02
  5. Step 5: Solve for x
    x = 314,416,945,262.02/641,617.68
  6. Step 6: Final answer
    x = 490,037.85

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1.5x scale

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.