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Finding the Fourth Proportional to 722,005.55, 996,329.78 and 395,255.92

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Solution

The fourth proportional to 722,005.55, 996,329.78 and 395,255.92 is: 545,432.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    722,005.55 : 996,329.78 = 395,255.92 : x
  2. Step 2: Convert to fraction form
    722,005.55/996,329.78 = 395,255.92/x
  3. Step 3: Cross multiply
    722,005.55x = 996,329.78 × 395,255.92
  4. Step 4: Simplify right side
    722,005.55x = 393,805,241,841.02
  5. Step 5: Solve for x
    x = 393,805,241,841.02/722,005.55
  6. Step 6: Final answer
    x = 545,432.43

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1.5x scale

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.