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Finding the Fourth Proportional to 710.21, 979.72 and 415.28

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Solution

The fourth proportional to 710.21, 979.72 and 415.28 is: 572.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.21 : 979.72 = 415.28 : x
  2. Step 2: Convert to fraction form
    710.21/979.72 = 415.28/x
  3. Step 3: Cross multiply
    710.21x = 979.72 × 415.28
  4. Step 4: Simplify right side
    710.21x = 406,858.12
  5. Step 5: Solve for x
    x = 406,858.12/710.21
  6. Step 6: Final answer
    x = 572.87

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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.