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Finding the Fourth Proportional to 387,361.45, 534,374.40 and 258,359.50

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Solution

The fourth proportional to 387,361.45, 534,374.40 and 258,359.50 is: 356,413.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,361.45 : 534,374.40 = 258,359.50 : x
  2. Step 2: Convert to fraction form
    387,361.45/534,374.40 = 258,359.50/x
  3. Step 3: Cross multiply
    387,361.45x = 534,374.40 × 258,359.50
  4. Step 4: Simplify right side
    387,361.45x = 138,060,702,796.80
  5. Step 5: Solve for x
    x = 138,060,702,796.80/387,361.45
  6. Step 6: Final answer
    x = 356,413.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.