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Finding the Fourth Proportional to 710.17, 979.90 and 415.43

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Solution

The fourth proportional to 710.17, 979.90 and 415.43 is: 573.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.17 : 979.90 = 415.43 : x
  2. Step 2: Convert to fraction form
    710.17/979.90 = 415.43/x
  3. Step 3: Cross multiply
    710.17x = 979.90 × 415.43
  4. Step 4: Simplify right side
    710.17x = 407,077.59
  5. Step 5: Solve for x
    x = 407,077.59/710.17
  6. Step 6: Final answer
    x = 573.21

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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.