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Finding the Fourth Proportional to 656.90, 905.46 and 499.01

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Solution

The fourth proportional to 656.90, 905.46 and 499.01 is: 687.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.90 : 905.46 = 499.01 : x
  2. Step 2: Convert to fraction form
    656.90/905.46 = 499.01/x
  3. Step 3: Cross multiply
    656.90x = 905.46 × 499.01
  4. Step 4: Simplify right side
    656.90x = 451,829.07
  5. Step 5: Solve for x
    x = 451,829.07/656.90
  6. Step 6: Final answer
    x = 687.83

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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.