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Finding the Fourth Proportional to 514.36, 709.32 and 390.16

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Solution

The fourth proportional to 514.36, 709.32 and 390.16 is: 538.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.36 : 709.32 = 390.16 : x
  2. Step 2: Convert to fraction form
    514.36/709.32 = 390.16/x
  3. Step 3: Cross multiply
    514.36x = 709.32 × 390.16
  4. Step 4: Simplify right side
    514.36x = 276,748.29
  5. Step 5: Solve for x
    x = 276,748.29/514.36
  6. Step 6: Final answer
    x = 538.04

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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.