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Finding the Fourth Proportional to 712.42, 1,068.78 and 279.58

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Solution

The fourth proportional to 712.42, 1,068.78 and 279.58 is: 419.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.42 : 1,068.78 = 279.58 : x
  2. Step 2: Convert to fraction form
    712.42/1,068.78 = 279.58/x
  3. Step 3: Cross multiply
    712.42x = 1,068.78 × 279.58
  4. Step 4: Simplify right side
    712.42x = 298,809.51
  5. Step 5: Solve for x
    x = 298,809.51/712.42
  6. Step 6: Final answer
    x = 419.43

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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.