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Finding the Fourth Proportional to 661.25, 990.58 and 353.00

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Solution

The fourth proportional to 661.25, 990.58 and 353.00 is: 528.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.25 : 990.58 = 353.00 : x
  2. Step 2: Convert to fraction form
    661.25/990.58 = 353.00/x
  3. Step 3: Cross multiply
    661.25x = 990.58 × 353.00
  4. Step 4: Simplify right side
    661.25x = 349,670.67
  5. Step 5: Solve for x
    x = 349,670.67/661.25
  6. Step 6: Final answer
    x = 528.81

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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.