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Finding the Fourth Proportional to 685,690.68, 946,255.86 and 399,407.52

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Solution

The fourth proportional to 685,690.68, 946,255.86 and 399,407.52 is: 551,183.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,690.68 : 946,255.86 = 399,407.52 : x
  2. Step 2: Convert to fraction form
    685,690.68/946,255.86 = 399,407.52/x
  3. Step 3: Cross multiply
    685,690.68x = 946,255.86 × 399,407.52
  4. Step 4: Simplify right side
    685,690.68x = 377,941,706,328.07
  5. Step 5: Solve for x
    x = 377,941,706,328.07/685,690.68
  6. Step 6: Final answer
    x = 551,183.96

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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.