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Finding the Fourth Proportional to 947.16, 1,420.86 and 485.22

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Solution

The fourth proportional to 947.16, 1,420.86 and 485.22 is: 727.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.16 : 1,420.86 = 485.22 : x
  2. Step 2: Convert to fraction form
    947.16/1,420.86 = 485.22/x
  3. Step 3: Cross multiply
    947.16x = 1,420.86 × 485.22
  4. Step 4: Simplify right side
    947.16x = 689,429.69
  5. Step 5: Solve for x
    x = 689,429.69/947.16
  6. Step 6: Final answer
    x = 727.89

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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.