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Finding the Fourth Proportional to 489,362.30, 734,043.45 and 438,040.70

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Solution

The fourth proportional to 489,362.30, 734,043.45 and 438,040.70 is: 657,061.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,362.30 : 734,043.45 = 438,040.70 : x
  2. Step 2: Convert to fraction form
    489,362.30/734,043.45 = 438,040.70/x
  3. Step 3: Cross multiply
    489,362.30x = 734,043.45 × 438,040.70
  4. Step 4: Simplify right side
    489,362.30x = 321,540,906,668.42
  5. Step 5: Solve for x
    x = 321,540,906,668.42/489,362.30
  6. Step 6: Final answer
    x = 657,061.05

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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.