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Finding the Fourth Proportional to 1,313.73, 1,971 and 436.86

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Solution

The fourth proportional to 1,313.73, 1,971 and 436.86 is: 655.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.73 : 1,971 = 436.86 : x
  2. Step 2: Convert to fraction form
    1,313.73/1,971 = 436.86/x
  3. Step 3: Cross multiply
    1,313.73x = 1,971 × 436.86
  4. Step 4: Simplify right side
    1,313.73x = 861,051.06
  5. Step 5: Solve for x
    x = 861,051.06/1,313.73
  6. Step 6: Final answer
    x = 655.42

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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.