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Finding the Fourth Proportional to 655.56, 904.70 and 393.56

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Solution

The fourth proportional to 655.56, 904.70 and 393.56 is: 543.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.56 : 904.70 = 393.56 : x
  2. Step 2: Convert to fraction form
    655.56/904.70 = 393.56/x
  3. Step 3: Cross multiply
    655.56x = 904.70 × 393.56
  4. Step 4: Simplify right side
    655.56x = 356,053.73
  5. Step 5: Solve for x
    x = 356,053.73/655.56
  6. Step 6: Final answer
    x = 543.13

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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.