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Finding the Fourth Proportional to 691.80, 954.74 and 381.32

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Solution

The fourth proportional to 691.80, 954.74 and 381.32 is: 526.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.80 : 954.74 = 381.32 : x
  2. Step 2: Convert to fraction form
    691.80/954.74 = 381.32/x
  3. Step 3: Cross multiply
    691.80x = 954.74 × 381.32
  4. Step 4: Simplify right side
    691.80x = 364,061.46
  5. Step 5: Solve for x
    x = 364,061.46/691.80
  6. Step 6: Final answer
    x = 526.25

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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.