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Finding the Fourth Proportional to 500.80, 690.64 and 314.23

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Solution

The fourth proportional to 500.80, 690.64 and 314.23 is: 433.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.80 : 690.64 = 314.23 : x
  2. Step 2: Convert to fraction form
    500.80/690.64 = 314.23/x
  3. Step 3: Cross multiply
    500.80x = 690.64 × 314.23
  4. Step 4: Simplify right side
    500.80x = 217,019.81
  5. Step 5: Solve for x
    x = 217,019.81/500.80
  6. Step 6: Final answer
    x = 433.35

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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.