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Finding the Fourth Proportional to 490,059.40, 686,783 and 490,059.40

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Solution

The fourth proportional to 490,059.40, 686,783 and 490,059.40 is: 686,783

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,059.40 : 686,783 = 490,059.40 : x
  2. Step 2: Convert to fraction form
    490,059.40/686,783 = 490,059.40/x
  3. Step 3: Cross multiply
    490,059.40x = 686,783 × 490,059.40
  4. Step 4: Simplify right side
    490,059.40x = 336,564,464,910.20
  5. Step 5: Solve for x
    x = 336,564,464,910.20/490,059.40
  6. Step 6: Final answer
    x = 686,783

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.