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Finding the Fourth Proportional to 328,147.20, 491,929.20 and 128,401.20

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Solution

The fourth proportional to 328,147.20, 491,929.20 and 128,401.20 is: 192,487.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,147.20 : 491,929.20 = 128,401.20 : x
  2. Step 2: Convert to fraction form
    328,147.20/491,929.20 = 128,401.20/x
  3. Step 3: Cross multiply
    328,147.20x = 491,929.20 × 128,401.20
  4. Step 4: Simplify right side
    328,147.20x = 63,164,299,595.04
  5. Step 5: Solve for x
    x = 63,164,299,595.04/328,147.20
  6. Step 6: Final answer
    x = 192,487.70

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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.