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Finding the Fourth Proportional to 642.21, 886.19 and 380.13

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Solution

The fourth proportional to 642.21, 886.19 and 380.13 is: 524.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.21 : 886.19 = 380.13 : x
  2. Step 2: Convert to fraction form
    642.21/886.19 = 380.13/x
  3. Step 3: Cross multiply
    642.21x = 886.19 × 380.13
  4. Step 4: Simplify right side
    642.21x = 336,865.50
  5. Step 5: Solve for x
    x = 336,865.50/642.21
  6. Step 6: Final answer
    x = 524.54

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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.