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Finding the Fourth Proportional to 620,664, 856,516.32 and 338,040

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Solution

The fourth proportional to 620,664, 856,516.32 and 338,040 is: 466,495.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,664 : 856,516.32 = 338,040 : x
  2. Step 2: Convert to fraction form
    620,664/856,516.32 = 338,040/x
  3. Step 3: Cross multiply
    620,664x = 856,516.32 × 338,040
  4. Step 4: Simplify right side
    620,664x = 289,536,776,812.80
  5. Step 5: Solve for x
    x = 289,536,776,812.80/620,664
  6. Step 6: Final answer
    x = 466,495.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.