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Finding the Fourth Proportional to 661,532.98, 912,955.35 and 389,782

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Solution

The fourth proportional to 661,532.98, 912,955.35 and 389,782 is: 537,922.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,532.98 : 912,955.35 = 389,782 : x
  2. Step 2: Convert to fraction form
    661,532.98/912,955.35 = 389,782/x
  3. Step 3: Cross multiply
    661,532.98x = 912,955.35 × 389,782
  4. Step 4: Simplify right side
    661,532.98x = 355,853,562,233.70
  5. Step 5: Solve for x
    x = 355,853,562,233.70/661,532.98
  6. Step 6: Final answer
    x = 537,922.63

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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.