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Finding the Fourth Proportional to 514.40, 709.56 and 339.80

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Solution

The fourth proportional to 514.40, 709.56 and 339.80 is: 468.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.40 : 709.56 = 339.80 : x
  2. Step 2: Convert to fraction form
    514.40/709.56 = 339.80/x
  3. Step 3: Cross multiply
    514.40x = 709.56 × 339.80
  4. Step 4: Simplify right side
    514.40x = 241,108.49
  5. Step 5: Solve for x
    x = 241,108.49/514.40
  6. Step 6: Final answer
    x = 468.72

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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.