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Finding the Fourth Proportional to 258,402.79, 356,615.81 and 155,040.85

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Solution

The fourth proportional to 258,402.79, 356,615.81 and 155,040.85 is: 213,968.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,402.79 : 356,615.81 = 155,040.85 : x
  2. Step 2: Convert to fraction form
    258,402.79/356,615.81 = 155,040.85/x
  3. Step 3: Cross multiply
    258,402.79x = 356,615.81 × 155,040.85
  4. Step 4: Simplify right side
    258,402.79x = 55,290,018,305.84
  5. Step 5: Solve for x
    x = 55,290,018,305.84/258,402.79
  6. Step 6: Final answer
    x = 213,968.35

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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.