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Finding the Fourth Proportional to 500,485.88, 690,662.68 and 285,620.40

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Solution

The fourth proportional to 500,485.88, 690,662.68 and 285,620.40 is: 394,151.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    500,485.88 : 690,662.68 = 285,620.40 : x
  2. Step 2: Convert to fraction form
    500,485.88/690,662.68 = 285,620.40/x
  3. Step 3: Cross multiply
    500,485.88x = 690,662.68 × 285,620.40
  4. Step 4: Simplify right side
    500,485.88x = 197,267,350,926.67
  5. Step 5: Solve for x
    x = 197,267,350,926.67/500,485.88
  6. Step 6: Final answer
    x = 394,151.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.