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Finding the Fourth Proportional to 1,380.23, 2,070.99 and 559.07

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Solution

The fourth proportional to 1,380.23, 2,070.99 and 559.07 is: 838.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.23 : 2,070.99 = 559.07 : x
  2. Step 2: Convert to fraction form
    1,380.23/2,070.99 = 559.07/x
  3. Step 3: Cross multiply
    1,380.23x = 2,070.99 × 559.07
  4. Step 4: Simplify right side
    1,380.23x = 1,157,818.02
  5. Step 5: Solve for x
    x = 1,157,818.02/1,380.23
  6. Step 6: Final answer
    x = 838.86

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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.