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Finding the Fourth Proportional to 1,431.55, 2,147.73 and 554.32

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Solution

The fourth proportional to 1,431.55, 2,147.73 and 554.32 is: 831.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.55 : 2,147.73 = 554.32 : x
  2. Step 2: Convert to fraction form
    1,431.55/2,147.73 = 554.32/x
  3. Step 3: Cross multiply
    1,431.55x = 2,147.73 × 554.32
  4. Step 4: Simplify right side
    1,431.55x = 1,190,529.69
  5. Step 5: Solve for x
    x = 1,190,529.69/1,431.55
  6. Step 6: Final answer
    x = 831.64

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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.