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Finding the Fourth Proportional to 328,609.40, 492,914.10 and 128,936.30

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Solution

The fourth proportional to 328,609.40, 492,914.10 and 128,936.30 is: 193,404.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,609.40 : 492,914.10 = 128,936.30 : x
  2. Step 2: Convert to fraction form
    328,609.40/492,914.10 = 128,936.30/x
  3. Step 3: Cross multiply
    328,609.40x = 492,914.10 × 128,936.30
  4. Step 4: Simplify right side
    328,609.40x = 63,554,520,271.83
  5. Step 5: Solve for x
    x = 63,554,520,271.83/328,609.40
  6. Step 6: Final answer
    x = 193,404.45

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.