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Finding the Fourth Proportional to 1,939.99, 2,909.01 and 707.21

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Solution

The fourth proportional to 1,939.99, 2,909.01 and 707.21 is: 1,060.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.99 : 2,909.01 = 707.21 : x
  2. Step 2: Convert to fraction form
    1,939.99/2,909.01 = 707.21/x
  3. Step 3: Cross multiply
    1,939.99x = 2,909.01 × 707.21
  4. Step 4: Simplify right side
    1,939.99x = 2,057,280.96
  5. Step 5: Solve for x
    x = 2,057,280.96/1,939.99
  6. Step 6: Final answer
    x = 1,060.46

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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.