Home / 1,154.40-1,731.60-1,147.20

Finding the Fourth Proportional to 1,154.40, 1,731.60 and 1,147.20

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Solution

The fourth proportional to 1,154.40, 1,731.60 and 1,147.20 is: 1,720.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,154.40 : 1,731.60 = 1,147.20 : x
  2. Step 2: Convert to fraction form
    1,154.40/1,731.60 = 1,147.20/x
  3. Step 3: Cross multiply
    1,154.40x = 1,731.60 × 1,147.20
  4. Step 4: Simplify right side
    1,154.40x = 1,986,491.52
  5. Step 5: Solve for x
    x = 1,986,491.52/1,154.40
  6. Step 6: Final answer
    x = 1,720.80

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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.