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Finding the Fourth Proportional to 659.90, 992.10 and 539.04

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Solution

The fourth proportional to 659.90, 992.10 and 539.04 is: 810.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.90 : 992.10 = 539.04 : x
  2. Step 2: Convert to fraction form
    659.90/992.10 = 539.04/x
  3. Step 3: Cross multiply
    659.90x = 992.10 × 539.04
  4. Step 4: Simplify right side
    659.90x = 534,781.58
  5. Step 5: Solve for x
    x = 534,781.58/659.90
  6. Step 6: Final answer
    x = 810.40

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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.