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Finding the Fourth Proportional to 665,372.85, 918,223.38 and 378,894.08

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Solution

The fourth proportional to 665,372.85, 918,223.38 and 378,894.08 is: 522,878.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,372.85 : 918,223.38 = 378,894.08 : x
  2. Step 2: Convert to fraction form
    665,372.85/918,223.38 = 378,894.08/x
  3. Step 3: Cross multiply
    665,372.85x = 918,223.38 × 378,894.08
  4. Step 4: Simplify right side
    665,372.85x = 347,909,398,208.47
  5. Step 5: Solve for x
    x = 347,909,398,208.47/665,372.85
  6. Step 6: Final answer
    x = 522,878.86

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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.