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Finding the Fourth Proportional to 1,147.68, 1,720.28 and 840.84

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Solution

The fourth proportional to 1,147.68, 1,720.28 and 840.84 is: 1,260.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.68 : 1,720.28 = 840.84 : x
  2. Step 2: Convert to fraction form
    1,147.68/1,720.28 = 840.84/x
  3. Step 3: Cross multiply
    1,147.68x = 1,720.28 × 840.84
  4. Step 4: Simplify right side
    1,147.68x = 1,446,480.24
  5. Step 5: Solve for x
    x = 1,446,480.24/1,147.68
  6. Step 6: Final answer
    x = 1,260.35

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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.