Home / 1,408.30-2,112.45-434.40

Finding the Fourth Proportional to 1,408.30, 2,112.45 and 434.40

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Solution

The fourth proportional to 1,408.30, 2,112.45 and 434.40 is: 651.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.30 : 2,112.45 = 434.40 : x
  2. Step 2: Convert to fraction form
    1,408.30/2,112.45 = 434.40/x
  3. Step 3: Cross multiply
    1,408.30x = 2,112.45 × 434.40
  4. Step 4: Simplify right side
    1,408.30x = 917,648.28
  5. Step 5: Solve for x
    x = 917,648.28/1,408.30
  6. Step 6: Final answer
    x = 651.60

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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.