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Finding the Fourth Proportional to 123,990.36, 171,108.54 and 67,401.78

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Solution

The fourth proportional to 123,990.36, 171,108.54 and 67,401.78 is: 93,015.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,990.36 : 171,108.54 = 67,401.78 : x
  2. Step 2: Convert to fraction form
    123,990.36/171,108.54 = 67,401.78/x
  3. Step 3: Cross multiply
    123,990.36x = 171,108.54 × 67,401.78
  4. Step 4: Simplify right side
    123,990.36x = 11,533,020,169.20
  5. Step 5: Solve for x
    x = 11,533,020,169.20/123,990.36
  6. Step 6: Final answer
    x = 93,015.46

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1.5x scale

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.