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Finding the Fourth Proportional to 611.80, 915.90 and 368.80

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Solution

The fourth proportional to 611.80, 915.90 and 368.80 is: 552.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.80 : 915.90 = 368.80 : x
  2. Step 2: Convert to fraction form
    611.80/915.90 = 368.80/x
  3. Step 3: Cross multiply
    611.80x = 915.90 × 368.80
  4. Step 4: Simplify right side
    611.80x = 337,783.92
  5. Step 5: Solve for x
    x = 337,783.92/611.80
  6. Step 6: Final answer
    x = 552.11

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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.