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Finding the Fourth Proportional to 500.16, 690.31 and 313.81

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Solution

The fourth proportional to 500.16, 690.31 and 313.81 is: 433.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.16 : 690.31 = 313.81 : x
  2. Step 2: Convert to fraction form
    500.16/690.31 = 313.81/x
  3. Step 3: Cross multiply
    500.16x = 690.31 × 313.81
  4. Step 4: Simplify right side
    500.16x = 216,624.61
  5. Step 5: Solve for x
    x = 216,624.61/500.16
  6. Step 6: Final answer
    x = 433.11

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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.