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Finding the Fourth Proportional to 1,147.64, 1,720.88 and 679.59

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Solution

The fourth proportional to 1,147.64, 1,720.88 and 679.59 is: 1,019.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.64 : 1,720.88 = 679.59 : x
  2. Step 2: Convert to fraction form
    1,147.64/1,720.88 = 679.59/x
  3. Step 3: Cross multiply
    1,147.64x = 1,720.88 × 679.59
  4. Step 4: Simplify right side
    1,147.64x = 1,169,492.84
  5. Step 5: Solve for x
    x = 1,169,492.84/1,147.64
  6. Step 6: Final answer
    x = 1,019.04

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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.