Home / 258,828.02-388,281.20-81,318.32

Finding the Fourth Proportional to 258,828.02, 388,281.20 and 81,318.32

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Solution

The fourth proportional to 258,828.02, 388,281.20 and 81,318.32 is: 121,989.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,828.02 : 388,281.20 = 81,318.32 : x
  2. Step 2: Convert to fraction form
    258,828.02/388,281.20 = 81,318.32/x
  3. Step 3: Cross multiply
    258,828.02x = 388,281.20 × 81,318.32
  4. Step 4: Simplify right side
    258,828.02x = 31,574,372,523.59
  5. Step 5: Solve for x
    x = 31,574,372,523.59/258,828.02
  6. Step 6: Final answer
    x = 121,989.78

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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.