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Finding the Fourth Proportional to 684.75, 944.95 and 389.96

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Solution

The fourth proportional to 684.75, 944.95 and 389.96 is: 538.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.75 : 944.95 = 389.96 : x
  2. Step 2: Convert to fraction form
    684.75/944.95 = 389.96/x
  3. Step 3: Cross multiply
    684.75x = 944.95 × 389.96
  4. Step 4: Simplify right side
    684.75x = 368,492.70
  5. Step 5: Solve for x
    x = 368,492.70/684.75
  6. Step 6: Final answer
    x = 538.14

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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.