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Finding the Fourth Proportional to 621,555.32, 857,435.82 and 392,396.60

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Solution

The fourth proportional to 621,555.32, 857,435.82 and 392,396.60 is: 541,311.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,555.32 : 857,435.82 = 392,396.60 : x
  2. Step 2: Convert to fraction form
    621,555.32/857,435.82 = 392,396.60/x
  3. Step 3: Cross multiply
    621,555.32x = 857,435.82 × 392,396.60
  4. Step 4: Simplify right side
    621,555.32x = 336,454,900,486.21
  5. Step 5: Solve for x
    x = 336,454,900,486.21/621,555.32
  6. Step 6: Final answer
    x = 541,311.27

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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.