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Finding the Fourth Proportional to 641,943.80, 885,871.60 and 355,457.72

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Solution

The fourth proportional to 641,943.80, 885,871.60 and 355,457.72 is: 490,525.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,943.80 : 885,871.60 = 355,457.72 : x
  2. Step 2: Convert to fraction form
    641,943.80/885,871.60 = 355,457.72/x
  3. Step 3: Cross multiply
    641,943.80x = 885,871.60 × 355,457.72
  4. Step 4: Simplify right side
    641,943.80x = 314,889,893,830.75
  5. Step 5: Solve for x
    x = 314,889,893,830.75/641,943.80
  6. Step 6: Final answer
    x = 490,525.64

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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.