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Finding the Fourth Proportional to 153,638.88, 212,020.89 and 89,121.16

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Solution

The fourth proportional to 153,638.88, 212,020.89 and 89,121.16 is: 122,986.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,638.88 : 212,020.89 = 89,121.16 : x
  2. Step 2: Convert to fraction form
    153,638.88/212,020.89 = 89,121.16/x
  3. Step 3: Cross multiply
    153,638.88x = 212,020.89 × 89,121.16
  4. Step 4: Simplify right side
    153,638.88x = 18,895,548,093.16
  5. Step 5: Solve for x
    x = 18,895,548,093.16/153,638.88
  6. Step 6: Final answer
    x = 122,986.76

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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.