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Finding the Fourth Proportional to 661,433.44, 912,751.70 and 389,512.80

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Solution

The fourth proportional to 661,433.44, 912,751.70 and 389,512.80 is: 537,512.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,433.44 : 912,751.70 = 389,512.80 : x
  2. Step 2: Convert to fraction form
    661,433.44/912,751.70 = 389,512.80/x
  3. Step 3: Cross multiply
    661,433.44x = 912,751.70 × 389,512.80
  4. Step 4: Simplify right side
    661,433.44x = 355,528,470,371.76
  5. Step 5: Solve for x
    x = 355,528,470,371.76/661,433.44
  6. Step 6: Final answer
    x = 537,512.09

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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.