Home / 1,285.10-1,927.95-419.42

Finding the Fourth Proportional to 1,285.10, 1,927.95 and 419.42

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Solution

The fourth proportional to 1,285.10, 1,927.95 and 419.42 is: 629.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.10 : 1,927.95 = 419.42 : x
  2. Step 2: Convert to fraction form
    1,285.10/1,927.95 = 419.42/x
  3. Step 3: Cross multiply
    1,285.10x = 1,927.95 × 419.42
  4. Step 4: Simplify right side
    1,285.10x = 808,620.79
  5. Step 5: Solve for x
    x = 808,620.79/1,285.10
  6. Step 6: Final answer
    x = 629.23

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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.