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Finding the Fourth Proportional to 892.71, 1,338.69 and 430.38

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Solution

The fourth proportional to 892.71, 1,338.69 and 430.38 is: 645.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.71 : 1,338.69 = 430.38 : x
  2. Step 2: Convert to fraction form
    892.71/1,338.69 = 430.38/x
  3. Step 3: Cross multiply
    892.71x = 1,338.69 × 430.38
  4. Step 4: Simplify right side
    892.71x = 576,145.40
  5. Step 5: Solve for x
    x = 576,145.40/892.71
  6. Step 6: Final answer
    x = 645.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.