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Finding the Fourth Proportional to 674.90, 931.38 and 380.15

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Solution

The fourth proportional to 674.90, 931.38 and 380.15 is: 524.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.90 : 931.38 = 380.15 : x
  2. Step 2: Convert to fraction form
    674.90/931.38 = 380.15/x
  3. Step 3: Cross multiply
    674.90x = 931.38 × 380.15
  4. Step 4: Simplify right side
    674.90x = 354,064.11
  5. Step 5: Solve for x
    x = 354,064.11/674.90
  6. Step 6: Final answer
    x = 524.62

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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.