Home / 1,289.10-1,933.56-423.40

Finding the Fourth Proportional to 1,289.10, 1,933.56 and 423.40

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Solution

The fourth proportional to 1,289.10, 1,933.56 and 423.40 is: 635.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.10 : 1,933.56 = 423.40 : x
  2. Step 2: Convert to fraction form
    1,289.10/1,933.56 = 423.40/x
  3. Step 3: Cross multiply
    1,289.10x = 1,933.56 × 423.40
  4. Step 4: Simplify right side
    1,289.10x = 818,669.30
  5. Step 5: Solve for x
    x = 818,669.30/1,289.10
  6. Step 6: Final answer
    x = 635.07

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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.