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Finding the Fourth Proportional to 515.15, 710.91 and 282.28

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Solution

The fourth proportional to 515.15, 710.91 and 282.28 is: 389.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.15 : 710.91 = 282.28 : x
  2. Step 2: Convert to fraction form
    515.15/710.91 = 282.28/x
  3. Step 3: Cross multiply
    515.15x = 710.91 × 282.28
  4. Step 4: Simplify right side
    515.15x = 200,670.71
  5. Step 5: Solve for x
    x = 200,670.71/515.15
  6. Step 6: Final answer
    x = 389.54

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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.