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Finding the Fourth Proportional to 645,471.72, 890,750.99 and 355,087.33

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Solution

The fourth proportional to 645,471.72, 890,750.99 and 355,087.33 is: 490,020.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,471.72 : 890,750.99 = 355,087.33 : x
  2. Step 2: Convert to fraction form
    645,471.72/890,750.99 = 355,087.33/x
  3. Step 3: Cross multiply
    645,471.72x = 890,750.99 × 355,087.33
  4. Step 4: Simplify right side
    645,471.72x = 316,294,390,733.96
  5. Step 5: Solve for x
    x = 316,294,390,733.96/645,471.72
  6. Step 6: Final answer
    x = 490,020.52

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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.