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Finding the Fourth Proportional to 1,147.40, 1,720.08 and 416.82

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Solution

The fourth proportional to 1,147.40, 1,720.08 and 416.82 is: 624.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.40 : 1,720.08 = 416.82 : x
  2. Step 2: Convert to fraction form
    1,147.40/1,720.08 = 416.82/x
  3. Step 3: Cross multiply
    1,147.40x = 1,720.08 × 416.82
  4. Step 4: Simplify right side
    1,147.40x = 716,963.75
  5. Step 5: Solve for x
    x = 716,963.75/1,147.40
  6. Step 6: Final answer
    x = 624.86

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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.