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Finding the Fourth Proportional to 660.99, 990.81 and 477.93

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Solution

The fourth proportional to 660.99, 990.81 and 477.93 is: 716.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.99 : 990.81 = 477.93 : x
  2. Step 2: Convert to fraction form
    660.99/990.81 = 477.93/x
  3. Step 3: Cross multiply
    660.99x = 990.81 × 477.93
  4. Step 4: Simplify right side
    660.99x = 473,537.82
  5. Step 5: Solve for x
    x = 473,537.82/660.99
  6. Step 6: Final answer
    x = 716.41

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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.