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Finding the Fourth Proportional to 821,612.40, 1,229,999.40 and 612,178.80

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Solution

The fourth proportional to 821,612.40, 1,229,999.40 and 612,178.80 is: 916,465.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,612.40 : 1,229,999.40 = 612,178.80 : x
  2. Step 2: Convert to fraction form
    821,612.40/1,229,999.40 = 612,178.80/x
  3. Step 3: Cross multiply
    821,612.40x = 1,229,999.40 × 612,178.80
  4. Step 4: Simplify right side
    821,612.40x = 752,979,556,692.72
  5. Step 5: Solve for x
    x = 752,979,556,692.72/821,612.40
  6. Step 6: Final answer
    x = 916,465.67

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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.