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Finding the Fourth Proportional to 500.12, 689.70 and 325.40

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Solution

The fourth proportional to 500.12, 689.70 and 325.40 is: 448.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.12 : 689.70 = 325.40 : x
  2. Step 2: Convert to fraction form
    500.12/689.70 = 325.40/x
  3. Step 3: Cross multiply
    500.12x = 689.70 × 325.40
  4. Step 4: Simplify right side
    500.12x = 224,428.38
  5. Step 5: Solve for x
    x = 224,428.38/500.12
  6. Step 6: Final answer
    x = 448.75

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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.