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Finding the Fourth Proportional to 642,351.72, 886,373.64 and 355,800.72

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Solution

The fourth proportional to 642,351.72, 886,373.64 and 355,800.72 is: 490,965.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,351.72 : 886,373.64 = 355,800.72 : x
  2. Step 2: Convert to fraction form
    642,351.72/886,373.64 = 355,800.72/x
  3. Step 3: Cross multiply
    642,351.72x = 886,373.64 × 355,800.72
  4. Step 4: Simplify right side
    642,351.72x = 315,372,379,301.02
  5. Step 5: Solve for x
    x = 315,372,379,301.02/642,351.72
  6. Step 6: Final answer
    x = 490,965.26

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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.