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Finding the Fourth Proportional to 259,440.13, 389,128 and 69,915.32

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Solution

The fourth proportional to 259,440.13, 389,128 and 69,915.32 is: 104,864.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,440.13 : 389,128 = 69,915.32 : x
  2. Step 2: Convert to fraction form
    259,440.13/389,128 = 69,915.32/x
  3. Step 3: Cross multiply
    259,440.13x = 389,128 × 69,915.32
  4. Step 4: Simplify right side
    259,440.13x = 27,206,008,640.96
  5. Step 5: Solve for x
    x = 27,206,008,640.96/259,440.13
  6. Step 6: Final answer
    x = 104,864.30

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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.