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Finding the Fourth Proportional to 319,934.85, 479,989.97 and 139,987.67

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Solution

The fourth proportional to 319,934.85, 479,989.97 and 139,987.67 is: 210,019.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,934.85 : 479,989.97 = 139,987.67 : x
  2. Step 2: Convert to fraction form
    319,934.85/479,989.97 = 139,987.67/x
  3. Step 3: Cross multiply
    319,934.85x = 479,989.97 × 139,987.67
  4. Step 4: Simplify right side
    319,934.85x = 67,192,674,423.78
  5. Step 5: Solve for x
    x = 67,192,674,423.78/319,934.85
  6. Step 6: Final answer
    x = 210,019.87

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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.