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Finding the Fourth Proportional to 642,220.40, 962,293.80 and 405,138.80

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Solution

The fourth proportional to 642,220.40, 962,293.80 and 405,138.80 is: 607,054.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,220.40 : 962,293.80 = 405,138.80 : x
  2. Step 2: Convert to fraction form
    642,220.40/962,293.80 = 405,138.80/x
  3. Step 3: Cross multiply
    642,220.40x = 962,293.80 × 405,138.80
  4. Step 4: Simplify right side
    642,220.40x = 389,862,555,379.44
  5. Step 5: Solve for x
    x = 389,862,555,379.44/642,220.40
  6. Step 6: Final answer
    x = 607,054.14

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1.5x scale

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.