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Finding the Fourth Proportional to 258,985.59, 388,441.47 and 81,487.98

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Solution

The fourth proportional to 258,985.59, 388,441.47 and 81,487.98 is: 122,220.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,985.59 : 388,441.47 = 81,487.98 : x
  2. Step 2: Convert to fraction form
    258,985.59/388,441.47 = 81,487.98/x
  3. Step 3: Cross multiply
    258,985.59x = 388,441.47 × 81,487.98
  4. Step 4: Simplify right side
    258,985.59x = 31,653,310,738.53
  5. Step 5: Solve for x
    x = 31,653,310,738.53/258,985.59
  6. Step 6: Final answer
    x = 122,220.36

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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.