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Finding the Fourth Proportional to 657.65, 986.88 and 384.28

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Solution

The fourth proportional to 657.65, 986.88 and 384.28 is: 576.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.65 : 986.88 = 384.28 : x
  2. Step 2: Convert to fraction form
    657.65/986.88 = 384.28/x
  3. Step 3: Cross multiply
    657.65x = 986.88 × 384.28
  4. Step 4: Simplify right side
    657.65x = 379,237.22
  5. Step 5: Solve for x
    x = 379,237.22/657.65
  6. Step 6: Final answer
    x = 576.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.