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Finding the Fourth Proportional to 947.27, 1,420.67 and 399.17

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Solution

The fourth proportional to 947.27, 1,420.67 and 399.17 is: 598.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.27 : 1,420.67 = 399.17 : x
  2. Step 2: Convert to fraction form
    947.27/1,420.67 = 399.17/x
  3. Step 3: Cross multiply
    947.27x = 1,420.67 × 399.17
  4. Step 4: Simplify right side
    947.27x = 567,079.74
  5. Step 5: Solve for x
    x = 567,079.74/947.27
  6. Step 6: Final answer
    x = 598.65

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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.