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Finding the Fourth Proportional to 258,810.37, 388,254.74 and 81,300.69

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Solution

The fourth proportional to 258,810.37, 388,254.74 and 81,300.69 is: 121,963.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,810.37 : 388,254.74 = 81,300.69 : x
  2. Step 2: Convert to fraction form
    258,810.37/388,254.74 = 81,300.69/x
  3. Step 3: Cross multiply
    258,810.37x = 388,254.74 × 81,300.69
  4. Step 4: Simplify right side
    258,810.37x = 31,565,377,851.27
  5. Step 5: Solve for x
    x = 31,565,377,851.27/258,810.37
  6. Step 6: Final answer
    x = 121,963.34

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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.