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Finding the Fourth Proportional to 154,622.34, 213,401.43 and 86,643.90

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Solution

The fourth proportional to 154,622.34, 213,401.43 and 86,643.90 is: 119,581.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,622.34 : 213,401.43 = 86,643.90 : x
  2. Step 2: Convert to fraction form
    154,622.34/213,401.43 = 86,643.90/x
  3. Step 3: Cross multiply
    154,622.34x = 213,401.43 × 86,643.90
  4. Step 4: Simplify right side
    154,622.34x = 18,489,932,160.78
  5. Step 5: Solve for x
    x = 18,489,932,160.78/154,622.34
  6. Step 6: Final answer
    x = 119,581.25

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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.