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Finding the Fourth Proportional to 490,086.80, 687,521.20 and 490,086.80

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Solution

The fourth proportional to 490,086.80, 687,521.20 and 490,086.80 is: 687,521.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,086.80 : 687,521.20 = 490,086.80 : x
  2. Step 2: Convert to fraction form
    490,086.80/687,521.20 = 490,086.80/x
  3. Step 3: Cross multiply
    490,086.80x = 687,521.20 × 490,086.80
  4. Step 4: Simplify right side
    490,086.80x = 336,945,064,840.16
  5. Step 5: Solve for x
    x = 336,945,064,840.16/490,086.80
  6. Step 6: Final answer
    x = 687,521.20

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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.