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Finding the Fourth Proportional to 642.16, 886.19 and 380.18

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Solution

The fourth proportional to 642.16, 886.19 and 380.18 is: 524.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.16 : 886.19 = 380.18 : x
  2. Step 2: Convert to fraction form
    642.16/886.19 = 380.18/x
  3. Step 3: Cross multiply
    642.16x = 886.19 × 380.18
  4. Step 4: Simplify right side
    642.16x = 336,911.71
  5. Step 5: Solve for x
    x = 336,911.71/642.16
  6. Step 6: Final answer
    x = 524.65

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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.