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Finding the Fourth Proportional to 1,242.78, 1,862.73 and 666.06

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Solution

The fourth proportional to 1,242.78, 1,862.73 and 666.06 is: 998.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.78 : 1,862.73 = 666.06 : x
  2. Step 2: Convert to fraction form
    1,242.78/1,862.73 = 666.06/x
  3. Step 3: Cross multiply
    1,242.78x = 1,862.73 × 666.06
  4. Step 4: Simplify right side
    1,242.78x = 1,240,689.94
  5. Step 5: Solve for x
    x = 1,240,689.94/1,242.78
  6. Step 6: Final answer
    x = 998.32

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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.