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Finding the Fourth Proportional to 704.59, 972.15 and 405.85

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Solution

The fourth proportional to 704.59, 972.15 and 405.85 is: 559.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.59 : 972.15 = 405.85 : x
  2. Step 2: Convert to fraction form
    704.59/972.15 = 405.85/x
  3. Step 3: Cross multiply
    704.59x = 972.15 × 405.85
  4. Step 4: Simplify right side
    704.59x = 394,547.08
  5. Step 5: Solve for x
    x = 394,547.08/704.59
  6. Step 6: Final answer
    x = 559.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.