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Finding the Fourth Proportional to 684.47, 944.55 and 389.72

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Solution

The fourth proportional to 684.47, 944.55 and 389.72 is: 537.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.47 : 944.55 = 389.72 : x
  2. Step 2: Convert to fraction form
    684.47/944.55 = 389.72/x
  3. Step 3: Cross multiply
    684.47x = 944.55 × 389.72
  4. Step 4: Simplify right side
    684.47x = 368,112.39
  5. Step 5: Solve for x
    x = 368,112.39/684.47
  6. Step 6: Final answer
    x = 537.80

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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.