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Finding the Fourth Proportional to 427,382.40, 641,131.20 and 146,985.60

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Solution

The fourth proportional to 427,382.40, 641,131.20 and 146,985.60 is: 220,498.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,382.40 : 641,131.20 = 146,985.60 : x
  2. Step 2: Convert to fraction form
    427,382.40/641,131.20 = 146,985.60/x
  3. Step 3: Cross multiply
    427,382.40x = 641,131.20 × 146,985.60
  4. Step 4: Simplify right side
    427,382.40x = 94,237,054,110.72
  5. Step 5: Solve for x
    x = 94,237,054,110.72/427,382.40
  6. Step 6: Final answer
    x = 220,498.21

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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.