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Finding the Fourth Proportional to 490,629.40, 735,944.10 and 428,421.40

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Solution

The fourth proportional to 490,629.40, 735,944.10 and 428,421.40 is: 642,632.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,629.40 : 735,944.10 = 428,421.40 : x
  2. Step 2: Convert to fraction form
    490,629.40/735,944.10 = 428,421.40/x
  3. Step 3: Cross multiply
    490,629.40x = 735,944.10 × 428,421.40
  4. Step 4: Simplify right side
    490,629.40x = 315,294,201,643.74
  5. Step 5: Solve for x
    x = 315,294,201,643.74/490,629.40
  6. Step 6: Final answer
    x = 642,632.10

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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.