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Finding the Fourth Proportional to 1,435.28, 2,152.28 and 666

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Solution

The fourth proportional to 1,435.28, 2,152.28 and 666 is: 998.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.28 : 2,152.28 = 666 : x
  2. Step 2: Convert to fraction form
    1,435.28/2,152.28 = 666/x
  3. Step 3: Cross multiply
    1,435.28x = 2,152.28 × 666
  4. Step 4: Simplify right side
    1,435.28x = 1,433,418.48
  5. Step 5: Solve for x
    x = 1,433,418.48/1,435.28
  6. Step 6: Final answer
    x = 998.70

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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.