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Finding the Fourth Proportional to 661,436.94, 912,713.08 and 389,487

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Solution

The fourth proportional to 661,436.94, 912,713.08 and 389,487 is: 537,450.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,436.94 : 912,713.08 = 389,487 : x
  2. Step 2: Convert to fraction form
    661,436.94/912,713.08 = 389,487/x
  3. Step 3: Cross multiply
    661,436.94x = 912,713.08 × 389,487
  4. Step 4: Simplify right side
    661,436.94x = 355,489,879,389.96
  5. Step 5: Solve for x
    x = 355,489,879,389.96/661,436.94
  6. Step 6: Final answer
    x = 537,450.90

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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.