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Finding the Fourth Proportional to 666.20, 918.98 and 433.33

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Solution

The fourth proportional to 666.20, 918.98 and 433.33 is: 597.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.20 : 918.98 = 433.33 : x
  2. Step 2: Convert to fraction form
    666.20/918.98 = 433.33/x
  3. Step 3: Cross multiply
    666.20x = 918.98 × 433.33
  4. Step 4: Simplify right side
    666.20x = 398,218.76
  5. Step 5: Solve for x
    x = 398,218.76/666.20
  6. Step 6: Final answer
    x = 597.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.