Home / 1,430.87-2,148.72-938.12

Finding the Fourth Proportional to 1,430.87, 2,148.72 and 938.12

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Solution

The fourth proportional to 1,430.87, 2,148.72 and 938.12 is: 1,408.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.87 : 2,148.72 = 938.12 : x
  2. Step 2: Convert to fraction form
    1,430.87/2,148.72 = 938.12/x
  3. Step 3: Cross multiply
    1,430.87x = 2,148.72 × 938.12
  4. Step 4: Simplify right side
    1,430.87x = 2,015,757.21
  5. Step 5: Solve for x
    x = 2,015,757.21/1,430.87
  6. Step 6: Final answer
    x = 1,408.76

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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.