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Finding the Fourth Proportional to 641,805.48, 885,691.55 and 355,344.01

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Solution

The fourth proportional to 641,805.48, 885,691.55 and 355,344.01 is: 490,374.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,805.48 : 885,691.55 = 355,344.01 : x
  2. Step 2: Convert to fraction form
    641,805.48/885,691.55 = 355,344.01/x
  3. Step 3: Cross multiply
    641,805.48x = 885,691.55 × 355,344.01
  4. Step 4: Simplify right side
    641,805.48x = 314,725,185,674.25
  5. Step 5: Solve for x
    x = 314,725,185,674.25/641,805.48
  6. Step 6: Final answer
    x = 490,374.72

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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.