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Finding the Fourth Proportional to 691.89, 954.84 and 381.39

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Solution

The fourth proportional to 691.89, 954.84 and 381.39 is: 526.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.89 : 954.84 = 381.39 : x
  2. Step 2: Convert to fraction form
    691.89/954.84 = 381.39/x
  3. Step 3: Cross multiply
    691.89x = 954.84 × 381.39
  4. Step 4: Simplify right side
    691.89x = 364,166.43
  5. Step 5: Solve for x
    x = 364,166.43/691.89
  6. Step 6: Final answer
    x = 526.34

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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.