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Finding the Fourth Proportional to 515.54, 711.45 and 282.67

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Solution

The fourth proportional to 515.54, 711.45 and 282.67 is: 390.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.54 : 711.45 = 282.67 : x
  2. Step 2: Convert to fraction form
    515.54/711.45 = 282.67/x
  3. Step 3: Cross multiply
    515.54x = 711.45 × 282.67
  4. Step 4: Simplify right side
    515.54x = 201,103.79
  5. Step 5: Solve for x
    x = 201,103.79/515.54
  6. Step 6: Final answer
    x = 390.08

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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.