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Finding the Fourth Proportional to 328,530.90, 492,796.35 and 128,857.80

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Solution

The fourth proportional to 328,530.90, 492,796.35 and 128,857.80 is: 193,286.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,530.90 : 492,796.35 = 128,857.80 : x
  2. Step 2: Convert to fraction form
    328,530.90/492,796.35 = 128,857.80/x
  3. Step 3: Cross multiply
    328,530.90x = 492,796.35 × 128,857.80
  4. Step 4: Simplify right side
    328,530.90x = 63,500,653,509.03
  5. Step 5: Solve for x
    x = 63,500,653,509.03/328,530.90
  6. Step 6: Final answer
    x = 193,286.70

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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.