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Finding the Fourth Proportional to 515.53, 711.45 and 282.66

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Solution

The fourth proportional to 515.53, 711.45 and 282.66 is: 390.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.53 : 711.45 = 282.66 : x
  2. Step 2: Convert to fraction form
    515.53/711.45 = 282.66/x
  3. Step 3: Cross multiply
    515.53x = 711.45 × 282.66
  4. Step 4: Simplify right side
    515.53x = 201,095.79
  5. Step 5: Solve for x
    x = 201,095.79/515.53
  6. Step 6: Final answer
    x = 390.07

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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.