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Finding the Fourth Proportional to 345,393.92, 518,128 and 108,743.68

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Solution

The fourth proportional to 345,393.92, 518,128 and 108,743.68 is: 163,127.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    345,393.92 : 518,128 = 108,743.68 : x
  2. Step 2: Convert to fraction form
    345,393.92/518,128 = 108,743.68/x
  3. Step 3: Cross multiply
    345,393.92x = 518,128 × 108,743.68
  4. Step 4: Simplify right side
    345,393.92x = 56,343,145,431.04
  5. Step 5: Solve for x
    x = 56,343,145,431.04/345,393.92
  6. Step 6: Final answer
    x = 163,127.21

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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.