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Finding the Fourth Proportional to 1,242.01, 1,862.95 and 420.26

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Solution

The fourth proportional to 1,242.01, 1,862.95 and 420.26 is: 630.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.01 : 1,862.95 = 420.26 : x
  2. Step 2: Convert to fraction form
    1,242.01/1,862.95 = 420.26/x
  3. Step 3: Cross multiply
    1,242.01x = 1,862.95 × 420.26
  4. Step 4: Simplify right side
    1,242.01x = 782,923.37
  5. Step 5: Solve for x
    x = 782,923.37/1,242.01
  6. Step 6: Final answer
    x = 630.37

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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.