Home / 1,218.90-1,828.34-478.56

Finding the Fourth Proportional to 1,218.90, 1,828.34 and 478.56

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Solution

The fourth proportional to 1,218.90, 1,828.34 and 478.56 is: 717.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.90 : 1,828.34 = 478.56 : x
  2. Step 2: Convert to fraction form
    1,218.90/1,828.34 = 478.56/x
  3. Step 3: Cross multiply
    1,218.90x = 1,828.34 × 478.56
  4. Step 4: Simplify right side
    1,218.90x = 874,970.39
  5. Step 5: Solve for x
    x = 874,970.39/1,218.90
  6. Step 6: Final answer
    x = 717.84

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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.