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Finding the Fourth Proportional to 1,147.67, 1,720.45 and 417.07

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Solution

The fourth proportional to 1,147.67, 1,720.45 and 417.07 is: 625.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.67 : 1,720.45 = 417.07 : x
  2. Step 2: Convert to fraction form
    1,147.67/1,720.45 = 417.07/x
  3. Step 3: Cross multiply
    1,147.67x = 1,720.45 × 417.07
  4. Step 4: Simplify right side
    1,147.67x = 717,548.08
  5. Step 5: Solve for x
    x = 717,548.08/1,147.67
  6. Step 6: Final answer
    x = 625.22

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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.