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Finding the Fourth Proportional to 258,840.60, 388,354.34 and 90,385.76

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Solution

The fourth proportional to 258,840.60, 388,354.34 and 90,385.76 is: 135,611.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,840.60 : 388,354.34 = 90,385.76 : x
  2. Step 2: Convert to fraction form
    258,840.60/388,354.34 = 90,385.76/x
  3. Step 3: Cross multiply
    258,840.60x = 388,354.34 × 90,385.76
  4. Step 4: Simplify right side
    258,840.60x = 35,101,702,170.20
  5. Step 5: Solve for x
    x = 35,101,702,170.20/258,840.60
  6. Step 6: Final answer
    x = 135,611.27

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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.