Home / 258,795.22-388,188.96-81,312.88

Finding the Fourth Proportional to 258,795.22, 388,188.96 and 81,312.88

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Solution

The fourth proportional to 258,795.22, 388,188.96 and 81,312.88 is: 121,968.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,795.22 : 388,188.96 = 81,312.88 : x
  2. Step 2: Convert to fraction form
    258,795.22/388,188.96 = 81,312.88/x
  3. Step 3: Cross multiply
    258,795.22x = 388,188.96 × 81,312.88
  4. Step 4: Simplify right side
    258,795.22x = 31,564,762,321.80
  5. Step 5: Solve for x
    x = 31,564,762,321.80/258,795.22
  6. Step 6: Final answer
    x = 121,968.10

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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.