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Finding the Fourth Proportional to 947.88, 1,423.26 and 654.66

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Solution

The fourth proportional to 947.88, 1,423.26 and 654.66 is: 982.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.88 : 1,423.26 = 654.66 : x
  2. Step 2: Convert to fraction form
    947.88/1,423.26 = 654.66/x
  3. Step 3: Cross multiply
    947.88x = 1,423.26 × 654.66
  4. Step 4: Simplify right side
    947.88x = 931,751.39
  5. Step 5: Solve for x
    x = 931,751.39/947.88
  6. Step 6: Final answer
    x = 982.98

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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.