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Finding the Fourth Proportional to 647,640.40, 970,999.80 and 248,126.80

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Solution

The fourth proportional to 647,640.40, 970,999.80 and 248,126.80 is: 372,013.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,640.40 : 970,999.80 = 248,126.80 : x
  2. Step 2: Convert to fraction form
    647,640.40/970,999.80 = 248,126.80/x
  3. Step 3: Cross multiply
    647,640.40x = 970,999.80 × 248,126.80
  4. Step 4: Simplify right side
    647,640.40x = 240,931,073,174.64
  5. Step 5: Solve for x
    x = 240,931,073,174.64/647,640.40
  6. Step 6: Final answer
    x = 372,013.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.