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Finding the Fourth Proportional to 661.36, 990.30 and 583.51

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Solution

The fourth proportional to 661.36, 990.30 and 583.51 is: 873.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.36 : 990.30 = 583.51 : x
  2. Step 2: Convert to fraction form
    661.36/990.30 = 583.51/x
  3. Step 3: Cross multiply
    661.36x = 990.30 × 583.51
  4. Step 4: Simplify right side
    661.36x = 577,849.95
  5. Step 5: Solve for x
    x = 577,849.95/661.36
  6. Step 6: Final answer
    x = 873.73

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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.