Home / 1,243.08-1,865.10-421.35

Finding the Fourth Proportional to 1,243.08, 1,865.10 and 421.35

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Solution

The fourth proportional to 1,243.08, 1,865.10 and 421.35 is: 632.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.08 : 1,865.10 = 421.35 : x
  2. Step 2: Convert to fraction form
    1,243.08/1,865.10 = 421.35/x
  3. Step 3: Cross multiply
    1,243.08x = 1,865.10 × 421.35
  4. Step 4: Simplify right side
    1,243.08x = 785,863.78
  5. Step 5: Solve for x
    x = 785,863.78/1,243.08
  6. Step 6: Final answer
    x = 632.19

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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.