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Finding the Fourth Proportional to 1,242.34, 1,714.39 and 682.81

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Solution

The fourth proportional to 1,242.34, 1,714.39 and 682.81 is: 942.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.34 : 1,714.39 = 682.81 : x
  2. Step 2: Convert to fraction form
    1,242.34/1,714.39 = 682.81/x
  3. Step 3: Cross multiply
    1,242.34x = 1,714.39 × 682.81
  4. Step 4: Simplify right side
    1,242.34x = 1,170,594.71
  5. Step 5: Solve for x
    x = 1,170,594.71/1,242.34
  6. Step 6: Final answer
    x = 942.25

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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.