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Finding the Fourth Proportional to 661.01, 990.27 and 352.40

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Solution

The fourth proportional to 661.01, 990.27 and 352.40 is: 527.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.01 : 990.27 = 352.40 : x
  2. Step 2: Convert to fraction form
    661.01/990.27 = 352.40/x
  3. Step 3: Cross multiply
    661.01x = 990.27 × 352.40
  4. Step 4: Simplify right side
    661.01x = 348,966.20
  5. Step 5: Solve for x
    x = 348,966.20/661.01
  6. Step 6: Final answer
    x = 527.93

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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.