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Finding the Fourth Proportional to 947.21, 1,423.05 and 558.21

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Solution

The fourth proportional to 947.21, 1,423.05 and 558.21 is: 838.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.21 : 1,423.05 = 558.21 : x
  2. Step 2: Convert to fraction form
    947.21/1,423.05 = 558.21/x
  3. Step 3: Cross multiply
    947.21x = 1,423.05 × 558.21
  4. Step 4: Simplify right side
    947.21x = 794,360.74
  5. Step 5: Solve for x
    x = 794,360.74/947.21
  6. Step 6: Final answer
    x = 838.63

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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.