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Finding the Fourth Proportional to 661,737.78, 912,950.73 and 389,639.34

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Solution

The fourth proportional to 661,737.78, 912,950.73 and 389,639.34 is: 537,556.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,737.78 : 912,950.73 = 389,639.34 : x
  2. Step 2: Convert to fraction form
    661,737.78/912,950.73 = 389,639.34/x
  3. Step 3: Cross multiply
    661,737.78x = 912,950.73 × 389,639.34
  4. Step 4: Simplify right side
    661,737.78x = 355,721,519,889.72
  5. Step 5: Solve for x
    x = 355,721,519,889.72/661,737.78
  6. Step 6: Final answer
    x = 537,556.61

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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.