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Finding the Fourth Proportional to 140,420.55, 210,650.55 and 45,620.31

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Solution

The fourth proportional to 140,420.55, 210,650.55 and 45,620.31 is: 68,436.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,420.55 : 210,650.55 = 45,620.31 : x
  2. Step 2: Convert to fraction form
    140,420.55/210,650.55 = 45,620.31/x
  3. Step 3: Cross multiply
    140,420.55x = 210,650.55 × 45,620.31
  4. Step 4: Simplify right side
    140,420.55x = 9,609,943,392.67
  5. Step 5: Solve for x
    x = 9,609,943,392.67/140,420.55
  6. Step 6: Final answer
    x = 68,436.87

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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.