Home / 1,405.76-1,927.85-1,389.56

Finding the Fourth Proportional to 1,405.76, 1,927.85 and 1,389.56

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Solution

The fourth proportional to 1,405.76, 1,927.85 and 1,389.56 is: 1,905.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.76 : 1,927.85 = 1,389.56 : x
  2. Step 2: Convert to fraction form
    1,405.76/1,927.85 = 1,389.56/x
  3. Step 3: Cross multiply
    1,405.76x = 1,927.85 × 1,389.56
  4. Step 4: Simplify right side
    1,405.76x = 2,678,871.54
  5. Step 5: Solve for x
    x = 2,678,871.54/1,405.76
  6. Step 6: Final answer
    x = 1,905.64

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.