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Finding the Fourth Proportional to 1,148.40, 1,720.80 and 736.80

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Solution

The fourth proportional to 1,148.40, 1,720.80 and 736.80 is: 1,104.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.40 : 1,720.80 = 736.80 : x
  2. Step 2: Convert to fraction form
    1,148.40/1,720.80 = 736.80/x
  3. Step 3: Cross multiply
    1,148.40x = 1,720.80 × 736.80
  4. Step 4: Simplify right side
    1,148.40x = 1,267,885.44
  5. Step 5: Solve for x
    x = 1,267,885.44/1,148.40
  6. Step 6: Final answer
    x = 1,104.05

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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.