Home / 809,407.40-1,214,111.10-389,503.40

Finding the Fourth Proportional to 809,407.40, 1,214,111.10 and 389,503.40

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Solution

The fourth proportional to 809,407.40, 1,214,111.10 and 389,503.40 is: 584,255.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,407.40 : 1,214,111.10 = 389,503.40 : x
  2. Step 2: Convert to fraction form
    809,407.40/1,214,111.10 = 389,503.40/x
  3. Step 3: Cross multiply
    809,407.40x = 1,214,111.10 × 389,503.40
  4. Step 4: Simplify right side
    809,407.40x = 472,900,401,427.74
  5. Step 5: Solve for x
    x = 472,900,401,427.74/809,407.40
  6. Step 6: Final answer
    x = 584,255.10

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Double scale
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Similar ratio
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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.