Home / 860,115.11-1,290,190.43-312,988.76

Finding the Fourth Proportional to 860,115.11, 1,290,190.43 and 312,988.76

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Solution

The fourth proportional to 860,115.11, 1,290,190.43 and 312,988.76 is: 469,489.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,115.11 : 1,290,190.43 = 312,988.76 : x
  2. Step 2: Convert to fraction form
    860,115.11/1,290,190.43 = 312,988.76/x
  3. Step 3: Cross multiply
    860,115.11x = 1,290,190.43 × 312,988.76
  4. Step 4: Simplify right side
    860,115.11x = 403,815,094,833.67
  5. Step 5: Solve for x
    x = 403,815,094,833.67/860,115.11
  6. Step 6: Final answer
    x = 469,489.60

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Double scale
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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.