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Finding the Fourth Proportional to 492,206.40, 738,309.60 and 421,347.60

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Solution

The fourth proportional to 492,206.40, 738,309.60 and 421,347.60 is: 632,021.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    492,206.40 : 738,309.60 = 421,347.60 : x
  2. Step 2: Convert to fraction form
    492,206.40/738,309.60 = 421,347.60/x
  3. Step 3: Cross multiply
    492,206.40x = 738,309.60 × 421,347.60
  4. Step 4: Simplify right side
    492,206.40x = 311,084,978,016.96
  5. Step 5: Solve for x
    x = 311,084,978,016.96/492,206.40
  6. Step 6: Final answer
    x = 632,021.40

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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.