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Finding the Fourth Proportional to 860,469.40, 1,290,704.10 and 487,221.40

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Solution

The fourth proportional to 860,469.40, 1,290,704.10 and 487,221.40 is: 730,832.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,469.40 : 1,290,704.10 = 487,221.40 : x
  2. Step 2: Convert to fraction form
    860,469.40/1,290,704.10 = 487,221.40/x
  3. Step 3: Cross multiply
    860,469.40x = 1,290,704.10 × 487,221.40
  4. Step 4: Simplify right side
    860,469.40x = 628,858,658,587.74
  5. Step 5: Solve for x
    x = 628,858,658,587.74/860,469.40
  6. Step 6: Final answer
    x = 730,832.10

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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.