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Finding the Fourth Proportional to 655.65, 904.78 and 356.90

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Solution

The fourth proportional to 655.65, 904.78 and 356.90 is: 492.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.65 : 904.78 = 356.90 : x
  2. Step 2: Convert to fraction form
    655.65/904.78 = 356.90/x
  3. Step 3: Cross multiply
    655.65x = 904.78 × 356.90
  4. Step 4: Simplify right side
    655.65x = 322,915.98
  5. Step 5: Solve for x
    x = 322,915.98/655.65
  6. Step 6: Final answer
    x = 492.51

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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.