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Finding the Third Proportional to 389,421.50 and 589,328.50

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Solution

The third proportional to 389,421.50 and 589,328.50 is: 891,856.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,421.50 : 589,328.50 = 589,328.50 : x
  2. Step 2: Convert to fraction form
    389,421.50/589,328.50 = 589,328.50/x
  3. Step 3: Cross multiply
    389,421.50x = 589,328.50 × 589,328.50
  4. Step 4: Simplify right side
    389,421.50x = 347,308,080,912.25
  5. Step 5: Solve for x
    x = 347,308,080,912.25/389,421.50
  6. Step 6: Final answer
    x = 891,856.46

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.