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Finding the Fourth Proportional to 212,430, 318,645 and 64,686

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Solution

The fourth proportional to 212,430, 318,645 and 64,686 is: 97,029

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,430 : 318,645 = 64,686 : x
  2. Step 2: Convert to fraction form
    212,430/318,645 = 64,686/x
  3. Step 3: Cross multiply
    212,430x = 318,645 × 64,686
  4. Step 4: Simplify right side
    212,430x = 20,611,870,470
  5. Step 5: Solve for x
    x = 20,611,870,470/212,430
  6. Step 6: Final answer
    x = 97,029

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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.