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Finding the Fourth Proportional to 1,242.16, 1,862.91 and 656.37

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Solution

The fourth proportional to 1,242.16, 1,862.91 and 656.37 is: 984.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.16 : 1,862.91 = 656.37 : x
  2. Step 2: Convert to fraction form
    1,242.16/1,862.91 = 656.37/x
  3. Step 3: Cross multiply
    1,242.16x = 1,862.91 × 656.37
  4. Step 4: Simplify right side
    1,242.16x = 1,222,758.24
  5. Step 5: Solve for x
    x = 1,222,758.24/1,242.16
  6. Step 6: Final answer
    x = 984.38

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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.