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Finding the Fourth Proportional to 1,071.47, 1,605.87 and 609.64

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Solution

The fourth proportional to 1,071.47, 1,605.87 and 609.64 is: 913.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.47 : 1,605.87 = 609.64 : x
  2. Step 2: Convert to fraction form
    1,071.47/1,605.87 = 609.64/x
  3. Step 3: Cross multiply
    1,071.47x = 1,605.87 × 609.64
  4. Step 4: Simplify right side
    1,071.47x = 978,998.57
  5. Step 5: Solve for x
    x = 978,998.57/1,071.47
  6. Step 6: Final answer
    x = 913.69

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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.