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Finding the Fourth Proportional to 640,548.70, 961,121.94 and 285,525.70

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Solution

The fourth proportional to 640,548.70, 961,121.94 and 285,525.70 is: 428,421.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,548.70 : 961,121.94 = 285,525.70 : x
  2. Step 2: Convert to fraction form
    640,548.70/961,121.94 = 285,525.70/x
  3. Step 3: Cross multiply
    640,548.70x = 961,121.94 × 285,525.70
  4. Step 4: Simplify right side
    640,548.70x = 274,425,014,703.86
  5. Step 5: Solve for x
    x = 274,425,014,703.86/640,548.70
  6. Step 6: Final answer
    x = 428,421.78

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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.