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Finding the Fourth Proportional to 642,308.94, 886,321.85 and 355,775.49

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Solution

The fourth proportional to 642,308.94, 886,321.85 and 355,775.49 is: 490,934.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,308.94 : 886,321.85 = 355,775.49 : x
  2. Step 2: Convert to fraction form
    642,308.94/886,321.85 = 355,775.49/x
  3. Step 3: Cross multiply
    642,308.94x = 886,321.85 × 355,775.49
  4. Step 4: Simplify right side
    642,308.94x = 315,331,588,702.58
  5. Step 5: Solve for x
    x = 315,331,588,702.58/642,308.94
  6. Step 6: Final answer
    x = 490,934.45

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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.