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Finding the Fourth Proportional to 1,242.46, 1,713.42 and 816.34

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Solution

The fourth proportional to 1,242.46, 1,713.42 and 816.34 is: 1,125.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.46 : 1,713.42 = 816.34 : x
  2. Step 2: Convert to fraction form
    1,242.46/1,713.42 = 816.34/x
  3. Step 3: Cross multiply
    1,242.46x = 1,713.42 × 816.34
  4. Step 4: Simplify right side
    1,242.46x = 1,398,720.63
  5. Step 5: Solve for x
    x = 1,398,720.63/1,242.46
  6. Step 6: Final answer
    x = 1,125.77

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1.5x scale

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.