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Finding the Fourth Proportional to 661, 990.56 and 452.58

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Solution

The fourth proportional to 661, 990.56 and 452.58 is: 678.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    661 : 990.56 = 452.58 : x
  2. Step 2: Convert to fraction form
    661/990.56 = 452.58/x
  3. Step 3: Cross multiply
    661x = 990.56 × 452.58
  4. Step 4: Simplify right side
    661x = 448,307.64
  5. Step 5: Solve for x
    x = 448,307.64/661
  6. Step 6: Final answer
    x = 678.23

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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.