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Finding the Fourth Proportional to 490,816.35, 687,609.45 and 490,816.35

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Solution

The fourth proportional to 490,816.35, 687,609.45 and 490,816.35 is: 687,609.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,816.35 : 687,609.45 = 490,816.35 : x
  2. Step 2: Convert to fraction form
    490,816.35/687,609.45 = 490,816.35/x
  3. Step 3: Cross multiply
    490,816.35x = 687,609.45 × 490,816.35
  4. Step 4: Simplify right side
    490,816.35x = 337,489,960,474.51
  5. Step 5: Solve for x
    x = 337,489,960,474.51/490,816.35
  6. Step 6: Final answer
    x = 687,609.45

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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.