Home / 1,385.50-2,078.27-398.35

Finding the Fourth Proportional to 1,385.50, 2,078.27 and 398.35

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Solution

The fourth proportional to 1,385.50, 2,078.27 and 398.35 is: 597.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.50 : 2,078.27 = 398.35 : x
  2. Step 2: Convert to fraction form
    1,385.50/2,078.27 = 398.35/x
  3. Step 3: Cross multiply
    1,385.50x = 2,078.27 × 398.35
  4. Step 4: Simplify right side
    1,385.50x = 827,866.47
  5. Step 5: Solve for x
    x = 827,866.47/1,385.50
  6. Step 6: Final answer
    x = 597.52

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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.