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Finding the Fourth Proportional to 154,189.80, 212,780.90 and 87,121.64

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Solution

The fourth proportional to 154,189.80, 212,780.90 and 87,121.64 is: 120,227.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,189.80 : 212,780.90 = 87,121.64 : x
  2. Step 2: Convert to fraction form
    154,189.80/212,780.90 = 87,121.64/x
  3. Step 3: Cross multiply
    154,189.80x = 212,780.90 × 87,121.64
  4. Step 4: Simplify right side
    154,189.80x = 18,537,820,968.68
  5. Step 5: Solve for x
    x = 18,537,820,968.68/154,189.80
  6. Step 6: Final answer
    x = 120,227.28

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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.