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Finding the Fourth Proportional to 426,028.57, 638,556.92 and 266,178

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Solution

The fourth proportional to 426,028.57, 638,556.92 and 266,178 is: 398,963.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,028.57 : 638,556.92 = 266,178 : x
  2. Step 2: Convert to fraction form
    426,028.57/638,556.92 = 266,178/x
  3. Step 3: Cross multiply
    426,028.57x = 638,556.92 × 266,178
  4. Step 4: Simplify right side
    426,028.57x = 169,969,803,851.76
  5. Step 5: Solve for x
    x = 169,969,803,851.76/426,028.57
  6. Step 6: Final answer
    x = 398,963.40

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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.