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Finding the Fourth Proportional to 258,368.34, 387,343.40 and 80,783.94

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Solution

The fourth proportional to 258,368.34, 387,343.40 and 80,783.94 is: 121,110.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,368.34 : 387,343.40 = 80,783.94 : x
  2. Step 2: Convert to fraction form
    258,368.34/387,343.40 = 80,783.94/x
  3. Step 3: Cross multiply
    258,368.34x = 387,343.40 × 80,783.94
  4. Step 4: Simplify right side
    258,368.34x = 31,291,125,985.00
  5. Step 5: Solve for x
    x = 31,291,125,985.00/258,368.34
  6. Step 6: Final answer
    x = 121,110.53

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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.