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Finding the Fourth Proportional to 500.31, 690.12 and 313.61

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Solution

The fourth proportional to 500.31, 690.12 and 313.61 is: 432.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.31 : 690.12 = 313.61 : x
  2. Step 2: Convert to fraction form
    500.31/690.12 = 313.61/x
  3. Step 3: Cross multiply
    500.31x = 690.12 × 313.61
  4. Step 4: Simplify right side
    500.31x = 216,425.08
  5. Step 5: Solve for x
    x = 216,425.08/500.31
  6. Step 6: Final answer
    x = 432.58

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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.