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Finding the Fourth Proportional to 628,540.74, 868,401 and 438,402.96

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Solution

The fourth proportional to 628,540.74, 868,401 and 438,402.96 is: 605,703.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,540.74 : 868,401 = 438,402.96 : x
  2. Step 2: Convert to fraction form
    628,540.74/868,401 = 438,402.96/x
  3. Step 3: Cross multiply
    628,540.74x = 868,401 × 438,402.96
  4. Step 4: Simplify right side
    628,540.74x = 380,709,568,866.96
  5. Step 5: Solve for x
    x = 380,709,568,866.96/628,540.74
  6. Step 6: Final answer
    x = 605,703.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.