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Finding the Fourth Proportional to 490,666.40, 735,999.60 and 428,458.40

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Solution

The fourth proportional to 490,666.40, 735,999.60 and 428,458.40 is: 642,687.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,666.40 : 735,999.60 = 428,458.40 : x
  2. Step 2: Convert to fraction form
    490,666.40/735,999.60 = 428,458.40/x
  3. Step 3: Cross multiply
    490,666.40x = 735,999.60 × 428,458.40
  4. Step 4: Simplify right side
    490,666.40x = 315,345,211,016.64
  5. Step 5: Solve for x
    x = 315,345,211,016.64/490,666.40
  6. Step 6: Final answer
    x = 642,687.60

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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.