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Finding the Fourth Proportional to 490,665.90, 688,506.90 and 490,665.90

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Solution

The fourth proportional to 490,665.90, 688,506.90 and 490,665.90 is: 688,506.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,665.90 : 688,506.90 = 490,665.90 : x
  2. Step 2: Convert to fraction form
    490,665.90/688,506.90 = 490,665.90/x
  3. Step 3: Cross multiply
    490,665.90x = 688,506.90 × 490,665.90
  4. Step 4: Simplify right side
    490,665.90x = 337,826,857,744.71
  5. Step 5: Solve for x
    x = 337,826,857,744.71/490,665.90
  6. Step 6: Final answer
    x = 688,506.90

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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.