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Finding the Fourth Proportional to 514.64, 710.88 and 428.40

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Solution

The fourth proportional to 514.64, 710.88 and 428.40 is: 591.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.64 : 710.88 = 428.40 : x
  2. Step 2: Convert to fraction form
    514.64/710.88 = 428.40/x
  3. Step 3: Cross multiply
    514.64x = 710.88 × 428.40
  4. Step 4: Simplify right side
    514.64x = 304,540.99
  5. Step 5: Solve for x
    x = 304,540.99/514.64
  6. Step 6: Final answer
    x = 591.76

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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.