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Finding the Fourth Proportional to 1,405.80, 2,109.99 and 712.95

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Solution

The fourth proportional to 1,405.80, 2,109.99 and 712.95 is: 1,070.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.80 : 2,109.99 = 712.95 : x
  2. Step 2: Convert to fraction form
    1,405.80/2,109.99 = 712.95/x
  3. Step 3: Cross multiply
    1,405.80x = 2,109.99 × 712.95
  4. Step 4: Simplify right side
    1,405.80x = 1,504,317.37
  5. Step 5: Solve for x
    x = 1,504,317.37/1,405.80
  6. Step 6: Final answer
    x = 1,070.08

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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.