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Finding the Fourth Proportional to 514.95, 710.79 and 305.12

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Solution

The fourth proportional to 514.95, 710.79 and 305.12 is: 421.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.95 : 710.79 = 305.12 : x
  2. Step 2: Convert to fraction form
    514.95/710.79 = 305.12/x
  3. Step 3: Cross multiply
    514.95x = 710.79 × 305.12
  4. Step 4: Simplify right side
    514.95x = 216,872.69
  5. Step 5: Solve for x
    x = 216,872.69/514.95
  6. Step 6: Final answer
    x = 421.15

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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.