Home / 828,000.20-1,242,000.30-509,135.60

Finding the Fourth Proportional to 828,000.20, 1,242,000.30 and 509,135.60

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Solution

The fourth proportional to 828,000.20, 1,242,000.30 and 509,135.60 is: 763,703.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    828,000.20 : 1,242,000.30 = 509,135.60 : x
  2. Step 2: Convert to fraction form
    828,000.20/1,242,000.30 = 509,135.60/x
  3. Step 3: Cross multiply
    828,000.20x = 1,242,000.30 × 509,135.60
  4. Step 4: Simplify right side
    828,000.20x = 632,346,567,940.68
  5. Step 5: Solve for x
    x = 632,346,567,940.68/828,000.20
  6. Step 6: Final answer
    x = 763,703.40

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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.