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Finding the Fourth Proportional to 1,242.21, 1,713.76 and 710.81

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Solution

The fourth proportional to 1,242.21, 1,713.76 and 710.81 is: 980.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.21 : 1,713.76 = 710.81 : x
  2. Step 2: Convert to fraction form
    1,242.21/1,713.76 = 710.81/x
  3. Step 3: Cross multiply
    1,242.21x = 1,713.76 × 710.81
  4. Step 4: Simplify right side
    1,242.21x = 1,218,149.18
  5. Step 5: Solve for x
    x = 1,218,149.18/1,242.21
  6. Step 6: Final answer
    x = 980.63

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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.