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Finding the Fourth Proportional to 659,990.90, 990,003.42 and 210,711.38

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Solution

The fourth proportional to 659,990.90, 990,003.42 and 210,711.38 is: 316,072.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,990.90 : 990,003.42 = 210,711.38 : x
  2. Step 2: Convert to fraction form
    659,990.90/990,003.42 = 210,711.38/x
  3. Step 3: Cross multiply
    659,990.90x = 990,003.42 × 210,711.38
  4. Step 4: Simplify right side
    659,990.90x = 208,604,986,832.92
  5. Step 5: Solve for x
    x = 208,604,986,832.92/659,990.90
  6. Step 6: Final answer
    x = 316,072.52

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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.