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Finding the Fourth Proportional to 1,761.30, 2,640.30 and 666.40

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Solution

The fourth proportional to 1,761.30, 2,640.30 and 666.40 is: 998.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.30 : 2,640.30 = 666.40 : x
  2. Step 2: Convert to fraction form
    1,761.30/2,640.30 = 666.40/x
  3. Step 3: Cross multiply
    1,761.30x = 2,640.30 × 666.40
  4. Step 4: Simplify right side
    1,761.30x = 1,759,495.92
  5. Step 5: Solve for x
    x = 1,759,495.92/1,761.30
  6. Step 6: Final answer
    x = 998.98

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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.