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Finding the Fourth Proportional to 947.38, 1,421.25 and 460.39

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Solution

The fourth proportional to 947.38, 1,421.25 and 460.39 is: 690.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.38 : 1,421.25 = 460.39 : x
  2. Step 2: Convert to fraction form
    947.38/1,421.25 = 460.39/x
  3. Step 3: Cross multiply
    947.38x = 1,421.25 × 460.39
  4. Step 4: Simplify right side
    947.38x = 654,329.29
  5. Step 5: Solve for x
    x = 654,329.29/947.38
  6. Step 6: Final answer
    x = 690.67

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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.