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Finding the Fourth Proportional to 1,415.93, 2,125.20 and 723.09

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Solution

The fourth proportional to 1,415.93, 2,125.20 and 723.09 is: 1,085.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.93 : 2,125.20 = 723.09 : x
  2. Step 2: Convert to fraction form
    1,415.93/2,125.20 = 723.09/x
  3. Step 3: Cross multiply
    1,415.93x = 2,125.20 × 723.09
  4. Step 4: Simplify right side
    1,415.93x = 1,536,710.87
  5. Step 5: Solve for x
    x = 1,536,710.87/1,415.93
  6. Step 6: Final answer
    x = 1,085.31

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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.