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Finding the Fourth Proportional to 775,889.80, 1,070,874.90 and 485,635.96

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Solution

The fourth proportional to 775,889.80, 1,070,874.90 and 485,635.96 is: 670,269.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    775,889.80 : 1,070,874.90 = 485,635.96 : x
  2. Step 2: Convert to fraction form
    775,889.80/1,070,874.90 = 485,635.96/x
  3. Step 3: Cross multiply
    775,889.80x = 1,070,874.90 × 485,635.96
  4. Step 4: Simplify right side
    775,889.80x = 520,055,360,101.40
  5. Step 5: Solve for x
    x = 520,055,360,101.40/775,889.80
  6. Step 6: Final answer
    x = 670,269.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.