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Finding the Fourth Proportional to 659.92, 990.24 and 386.26

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Solution

The fourth proportional to 659.92, 990.24 and 386.26 is: 579.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.92 : 990.24 = 386.26 : x
  2. Step 2: Convert to fraction form
    659.92/990.24 = 386.26/x
  3. Step 3: Cross multiply
    659.92x = 990.24 × 386.26
  4. Step 4: Simplify right side
    659.92x = 382,490.10
  5. Step 5: Solve for x
    x = 382,490.10/659.92
  6. Step 6: Final answer
    x = 579.60

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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.