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Finding the Fourth Proportional to 425,274.48, 638,307 and 215,063.28

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Solution

The fourth proportional to 425,274.48, 638,307 and 215,063.28 is: 322,794.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,274.48 : 638,307 = 215,063.28 : x
  2. Step 2: Convert to fraction form
    425,274.48/638,307 = 215,063.28/x
  3. Step 3: Cross multiply
    425,274.48x = 638,307 × 215,063.28
  4. Step 4: Simplify right side
    425,274.48x = 137,276,397,066.96
  5. Step 5: Solve for x
    x = 137,276,397,066.96/425,274.48
  6. Step 6: Final answer
    x = 322,794.81

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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.