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Finding the Fourth Proportional to 1,405.26, 1,939.19 and 815.99

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Solution

The fourth proportional to 1,405.26, 1,939.19 and 815.99 is: 1,126.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.26 : 1,939.19 = 815.99 : x
  2. Step 2: Convert to fraction form
    1,405.26/1,939.19 = 815.99/x
  3. Step 3: Cross multiply
    1,405.26x = 1,939.19 × 815.99
  4. Step 4: Simplify right side
    1,405.26x = 1,582,345.87
  5. Step 5: Solve for x
    x = 1,582,345.87/1,405.26
  6. Step 6: Final answer
    x = 1,126.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.