Home / 258,904.08-388,356.12-81,426.60

Finding the Fourth Proportional to 258,904.08, 388,356.12 and 81,426.60

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Solution

The fourth proportional to 258,904.08, 388,356.12 and 81,426.60 is: 122,139.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,904.08 : 388,356.12 = 81,426.60 : x
  2. Step 2: Convert to fraction form
    258,904.08/388,356.12 = 81,426.60/x
  3. Step 3: Cross multiply
    258,904.08x = 388,356.12 × 81,426.60
  4. Step 4: Simplify right side
    258,904.08x = 31,622,518,440.79
  5. Step 5: Solve for x
    x = 31,622,518,440.79/258,904.08
  6. Step 6: Final answer
    x = 122,139.90

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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.