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Finding the Fourth Proportional to 679.49, 937.66 and 384.78

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Solution

The fourth proportional to 679.49, 937.66 and 384.78 is: 530.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.49 : 937.66 = 384.78 : x
  2. Step 2: Convert to fraction form
    679.49/937.66 = 384.78/x
  3. Step 3: Cross multiply
    679.49x = 937.66 × 384.78
  4. Step 4: Simplify right side
    679.49x = 360,790.89
  5. Step 5: Solve for x
    x = 360,790.89/679.49
  6. Step 6: Final answer
    x = 530.98

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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.