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Finding the Fourth Proportional to 1,147.14, 1,720.86 and 417.06

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Solution

The fourth proportional to 1,147.14, 1,720.86 and 417.06 is: 625.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.14 : 1,720.86 = 417.06 : x
  2. Step 2: Convert to fraction form
    1,147.14/1,720.86 = 417.06/x
  3. Step 3: Cross multiply
    1,147.14x = 1,720.86 × 417.06
  4. Step 4: Simplify right side
    1,147.14x = 717,701.87
  5. Step 5: Solve for x
    x = 717,701.87/1,147.14
  6. Step 6: Final answer
    x = 625.64

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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.