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Finding the Fourth Proportional to 709.74, 978.66 and 513.36

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Solution

The fourth proportional to 709.74, 978.66 and 513.36 is: 707.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.74 : 978.66 = 513.36 : x
  2. Step 2: Convert to fraction form
    709.74/978.66 = 513.36/x
  3. Step 3: Cross multiply
    709.74x = 978.66 × 513.36
  4. Step 4: Simplify right side
    709.74x = 502,404.90
  5. Step 5: Solve for x
    x = 502,404.90/709.74
  6. Step 6: Final answer
    x = 707.87

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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.