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Finding the Fourth Proportional to 678.91, 936.91 and 384.17

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Solution

The fourth proportional to 678.91, 936.91 and 384.17 is: 530.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.91 : 936.91 = 384.17 : x
  2. Step 2: Convert to fraction form
    678.91/936.91 = 384.17/x
  3. Step 3: Cross multiply
    678.91x = 936.91 × 384.17
  4. Step 4: Simplify right side
    678.91x = 359,926.11
  5. Step 5: Solve for x
    x = 359,926.11/678.91
  6. Step 6: Final answer
    x = 530.16

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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.