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Finding the Fourth Proportional to 422,478.09, 630,643.93 and 391,255.93

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Solution

The fourth proportional to 422,478.09, 630,643.93 and 391,255.93 is: 584,037.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,478.09 : 630,643.93 = 391,255.93 : x
  2. Step 2: Convert to fraction form
    422,478.09/630,643.93 = 391,255.93/x
  3. Step 3: Cross multiply
    422,478.09x = 630,643.93 × 391,255.93
  4. Step 4: Simplify right side
    422,478.09x = 246,743,175,367.48
  5. Step 5: Solve for x
    x = 246,743,175,367.48/422,478.09
  6. Step 6: Final answer
    x = 584,037.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.