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Finding the Fourth Proportional to 212,072.61, 318,108.98 and 99,670.29

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Solution

The fourth proportional to 212,072.61, 318,108.98 and 99,670.29 is: 149,505.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,072.61 : 318,108.98 = 99,670.29 : x
  2. Step 2: Convert to fraction form
    212,072.61/318,108.98 = 99,670.29/x
  3. Step 3: Cross multiply
    212,072.61x = 318,108.98 × 99,670.29
  4. Step 4: Simplify right side
    212,072.61x = 31,706,013,789.85
  5. Step 5: Solve for x
    x = 31,706,013,789.85/212,072.61
  6. Step 6: Final answer
    x = 149,505.46

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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.