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Finding the Fourth Proportional to 515.70, 709.56 and 399.06

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Solution

The fourth proportional to 515.70, 709.56 and 399.06 is: 549.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.70 : 709.56 = 399.06 : x
  2. Step 2: Convert to fraction form
    515.70/709.56 = 399.06/x
  3. Step 3: Cross multiply
    515.70x = 709.56 × 399.06
  4. Step 4: Simplify right side
    515.70x = 283,157.01
  5. Step 5: Solve for x
    x = 283,157.01/515.70
  6. Step 6: Final answer
    x = 549.07

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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.