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Finding the Fourth Proportional to 489,618.40, 734,427.60 and 321,656.80

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Solution

The fourth proportional to 489,618.40, 734,427.60 and 321,656.80 is: 482,485.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,618.40 : 734,427.60 = 321,656.80 : x
  2. Step 2: Convert to fraction form
    489,618.40/734,427.60 = 321,656.80/x
  3. Step 3: Cross multiply
    489,618.40x = 734,427.60 × 321,656.80
  4. Step 4: Simplify right side
    489,618.40x = 236,233,631,647.68
  5. Step 5: Solve for x
    x = 236,233,631,647.68/489,618.40
  6. Step 6: Final answer
    x = 482,485.20

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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.