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Finding the Fourth Proportional to 319,625.40, 479,000.70 and 212,705.40

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Solution

The fourth proportional to 319,625.40, 479,000.70 and 212,705.40 is: 318,767.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,625.40 : 479,000.70 = 212,705.40 : x
  2. Step 2: Convert to fraction form
    319,625.40/479,000.70 = 212,705.40/x
  3. Step 3: Cross multiply
    319,625.40x = 479,000.70 × 212,705.40
  4. Step 4: Simplify right side
    319,625.40x = 101,886,035,493.78
  5. Step 5: Solve for x
    x = 101,886,035,493.78/319,625.40
  6. Step 6: Final answer
    x = 318,767.02

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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.