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Finding the Fourth Proportional to 520.70, 718.55 and 284.63

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Solution

The fourth proportional to 520.70, 718.55 and 284.63 is: 392.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.70 : 718.55 = 284.63 : x
  2. Step 2: Convert to fraction form
    520.70/718.55 = 284.63/x
  3. Step 3: Cross multiply
    520.70x = 718.55 × 284.63
  4. Step 4: Simplify right side
    520.70x = 204,522.58
  5. Step 5: Solve for x
    x = 204,522.58/520.70
  6. Step 6: Final answer
    x = 392.79

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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.