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Finding the Fourth Proportional to 213,635.90, 320,485.73 and 78,689.69

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Solution

The fourth proportional to 213,635.90, 320,485.73 and 78,689.69 is: 118,046.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,635.90 : 320,485.73 = 78,689.69 : x
  2. Step 2: Convert to fraction form
    213,635.90/320,485.73 = 78,689.69/x
  3. Step 3: Cross multiply
    213,635.90x = 320,485.73 × 78,689.69
  4. Step 4: Simplify right side
    213,635.90x = 25,218,920,747.25
  5. Step 5: Solve for x
    x = 25,218,920,747.25/213,635.90
  6. Step 6: Final answer
    x = 118,046.27

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1.5x scale

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.