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Finding the Fourth Proportional to 709.90, 979.90 and 415.26

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Solution

The fourth proportional to 709.90, 979.90 and 415.26 is: 573.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.90 : 979.90 = 415.26 : x
  2. Step 2: Convert to fraction form
    709.90/979.90 = 415.26/x
  3. Step 3: Cross multiply
    709.90x = 979.90 × 415.26
  4. Step 4: Simplify right side
    709.90x = 406,913.27
  5. Step 5: Solve for x
    x = 406,913.27/709.90
  6. Step 6: Final answer
    x = 573.20

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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.