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Finding the Fourth Proportional to 520.50, 718.35 and 313.50

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Solution

The fourth proportional to 520.50, 718.35 and 313.50 is: 432.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.50 : 718.35 = 313.50 : x
  2. Step 2: Convert to fraction form
    520.50/718.35 = 313.50/x
  3. Step 3: Cross multiply
    520.50x = 718.35 × 313.50
  4. Step 4: Simplify right side
    520.50x = 225,202.73
  5. Step 5: Solve for x
    x = 225,202.73/520.50
  6. Step 6: Final answer
    x = 432.67

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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.