Home / 1,203.20-1,638.08-1,192.40

Finding the Fourth Proportional to 1,203.20, 1,638.08 and 1,192.40

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Solution

The fourth proportional to 1,203.20, 1,638.08 and 1,192.40 is: 1,623.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.20 : 1,638.08 = 1,192.40 : x
  2. Step 2: Convert to fraction form
    1,203.20/1,638.08 = 1,192.40/x
  3. Step 3: Cross multiply
    1,203.20x = 1,638.08 × 1,192.40
  4. Step 4: Simplify right side
    1,203.20x = 1,953,246.59
  5. Step 5: Solve for x
    x = 1,953,246.59/1,203.20
  6. Step 6: Final answer
    x = 1,623.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.