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Finding the Fourth Proportional to 659.99, 989.07 and 548.81

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Solution

The fourth proportional to 659.99, 989.07 and 548.81 is: 822.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.99 : 989.07 = 548.81 : x
  2. Step 2: Convert to fraction form
    659.99/989.07 = 548.81/x
  3. Step 3: Cross multiply
    659.99x = 989.07 × 548.81
  4. Step 4: Simplify right side
    659.99x = 542,811.51
  5. Step 5: Solve for x
    x = 542,811.51/659.99
  6. Step 6: Final answer
    x = 822.45

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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.