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Finding the Fourth Proportional to 515.32, 711.02 and 389.42

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Solution

The fourth proportional to 515.32, 711.02 and 389.42 is: 537.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.32 : 711.02 = 389.42 : x
  2. Step 2: Convert to fraction form
    515.32/711.02 = 389.42/x
  3. Step 3: Cross multiply
    515.32x = 711.02 × 389.42
  4. Step 4: Simplify right side
    515.32x = 276,885.41
  5. Step 5: Solve for x
    x = 276,885.41/515.32
  6. Step 6: Final answer
    x = 537.31

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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.