Home / 255,621.36-383,418.10-78,128.31

Finding the Fourth Proportional to 255,621.36, 383,418.10 and 78,128.31

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Solution

The fourth proportional to 255,621.36, 383,418.10 and 78,128.31 is: 117,188.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,621.36 : 383,418.10 = 78,128.31 : x
  2. Step 2: Convert to fraction form
    255,621.36/383,418.10 = 78,128.31/x
  3. Step 3: Cross multiply
    255,621.36x = 383,418.10 × 78,128.31
  4. Step 4: Simplify right side
    255,621.36x = 29,955,809,272.42
  5. Step 5: Solve for x
    x = 29,955,809,272.42/255,621.36
  6. Step 6: Final answer
    x = 117,188.21

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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.