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Finding the Fourth Proportional to 154,487.90, 213,213.42 and 86,530.84

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Solution

The fourth proportional to 154,487.90, 213,213.42 and 86,530.84 is: 119,423.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,487.90 : 213,213.42 = 86,530.84 : x
  2. Step 2: Convert to fraction form
    154,487.90/213,213.42 = 86,530.84/x
  3. Step 3: Cross multiply
    154,487.90x = 213,213.42 × 86,530.84
  4. Step 4: Simplify right side
    154,487.90x = 18,449,536,331.87
  5. Step 5: Solve for x
    x = 18,449,536,331.87/154,487.90
  6. Step 6: Final answer
    x = 119,423.83

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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.