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Finding the Fourth Proportional to 709.74, 979.43 and 415.01

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Solution

The fourth proportional to 709.74, 979.43 and 415.01 is: 572.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.74 : 979.43 = 415.01 : x
  2. Step 2: Convert to fraction form
    709.74/979.43 = 415.01/x
  3. Step 3: Cross multiply
    709.74x = 979.43 × 415.01
  4. Step 4: Simplify right side
    709.74x = 406,473.62
  5. Step 5: Solve for x
    x = 406,473.62/709.74
  6. Step 6: Final answer
    x = 572.71

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1.5x scale

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.