Home / 860,115.29-1,290,190.70-312,988.94

Finding the Fourth Proportional to 860,115.29, 1,290,190.70 and 312,988.94

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Solution

The fourth proportional to 860,115.29, 1,290,190.70 and 312,988.94 is: 469,489.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,115.29 : 1,290,190.70 = 312,988.94 : x
  2. Step 2: Convert to fraction form
    860,115.29/1,290,190.70 = 312,988.94/x
  3. Step 3: Cross multiply
    860,115.29x = 1,290,190.70 × 312,988.94
  4. Step 4: Simplify right side
    860,115.29x = 403,815,419,590.86
  5. Step 5: Solve for x
    x = 403,815,419,590.86/860,115.29
  6. Step 6: Final answer
    x = 469,489.87

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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.