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Finding the Fourth Proportional to 1,313.70, 1,811.21 and 921.26

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Solution

The fourth proportional to 1,313.70, 1,811.21 and 921.26 is: 1,270.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.70 : 1,811.21 = 921.26 : x
  2. Step 2: Convert to fraction form
    1,313.70/1,811.21 = 921.26/x
  3. Step 3: Cross multiply
    1,313.70x = 1,811.21 × 921.26
  4. Step 4: Simplify right side
    1,313.70x = 1,668,581.66
  5. Step 5: Solve for x
    x = 1,668,581.66/1,313.70
  6. Step 6: Final answer
    x = 1,270.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.