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Finding the Fourth Proportional to 438,729.60, 605,391.19 and 257,375.36

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Solution

The fourth proportional to 438,729.60, 605,391.19 and 257,375.36 is: 355,145.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,729.60 : 605,391.19 = 257,375.36 : x
  2. Step 2: Convert to fraction form
    438,729.60/605,391.19 = 257,375.36/x
  3. Step 3: Cross multiply
    438,729.60x = 605,391.19 × 257,375.36
  4. Step 4: Simplify right side
    438,729.60x = 155,812,775,467.08
  5. Step 5: Solve for x
    x = 155,812,775,467.08/438,729.60
  6. Step 6: Final answer
    x = 355,145.35

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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.