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Finding the Fourth Proportional to 640,100.98, 883,303.87 and 398,375.92

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Solution

The fourth proportional to 640,100.98, 883,303.87 and 398,375.92 is: 549,736.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,100.98 : 883,303.87 = 398,375.92 : x
  2. Step 2: Convert to fraction form
    640,100.98/883,303.87 = 398,375.92/x
  3. Step 3: Cross multiply
    640,100.98x = 883,303.87 × 398,375.92
  4. Step 4: Simplify right side
    640,100.98x = 351,886,985,442.41
  5. Step 5: Solve for x
    x = 351,886,985,442.41/640,100.98
  6. Step 6: Final answer
    x = 549,736.68

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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.