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Finding the Fourth Proportional to 661,908.40, 992,639.76 and 212,518.96

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Solution

The fourth proportional to 661,908.40, 992,639.76 and 212,518.96 is: 318,706.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,908.40 : 992,639.76 = 212,518.96 : x
  2. Step 2: Convert to fraction form
    661,908.40/992,639.76 = 212,518.96/x
  3. Step 3: Cross multiply
    661,908.40x = 992,639.76 × 212,518.96
  4. Step 4: Simplify right side
    661,908.40x = 210,954,769,449.85
  5. Step 5: Solve for x
    x = 210,954,769,449.85/661,908.40
  6. Step 6: Final answer
    x = 318,706.89

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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.