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Finding the Fourth Proportional to 947.67, 1,420.06 and 399.56

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Solution

The fourth proportional to 947.67, 1,420.06 and 399.56 is: 598.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.67 : 1,420.06 = 399.56 : x
  2. Step 2: Convert to fraction form
    947.67/1,420.06 = 399.56/x
  3. Step 3: Cross multiply
    947.67x = 1,420.06 × 399.56
  4. Step 4: Simplify right side
    947.67x = 567,391.07
  5. Step 5: Solve for x
    x = 567,391.07/947.67
  6. Step 6: Final answer
    x = 598.72

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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.