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Finding the Fourth Proportional to 687.70, 948.29 and 520.03

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Solution

The fourth proportional to 687.70, 948.29 and 520.03 is: 717.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.70 : 948.29 = 520.03 : x
  2. Step 2: Convert to fraction form
    687.70/948.29 = 520.03/x
  3. Step 3: Cross multiply
    687.70x = 948.29 × 520.03
  4. Step 4: Simplify right side
    687.70x = 493,139.25
  5. Step 5: Solve for x
    x = 493,139.25/687.70
  6. Step 6: Final answer
    x = 717.08

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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.