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Finding the Fourth Proportional to 426,486.78, 639,686.21 and 142,146.60

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Solution

The fourth proportional to 426,486.78, 639,686.21 and 142,146.60 is: 213,205.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,486.78 : 639,686.21 = 142,146.60 : x
  2. Step 2: Convert to fraction form
    426,486.78/639,686.21 = 142,146.60/x
  3. Step 3: Cross multiply
    426,486.78x = 639,686.21 × 142,146.60
  4. Step 4: Simplify right side
    426,486.78x = 90,929,219,107.65
  5. Step 5: Solve for x
    x = 90,929,219,107.65/426,486.78
  6. Step 6: Final answer
    x = 213,205.25

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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.