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Finding the Fourth Proportional to 712.16, 1,068.39 and 279.35

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Solution

The fourth proportional to 712.16, 1,068.39 and 279.35 is: 419.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.16 : 1,068.39 = 279.35 : x
  2. Step 2: Convert to fraction form
    712.16/1,068.39 = 279.35/x
  3. Step 3: Cross multiply
    712.16x = 1,068.39 × 279.35
  4. Step 4: Simplify right side
    712.16x = 298,454.75
  5. Step 5: Solve for x
    x = 298,454.75/712.16
  6. Step 6: Final answer
    x = 419.08

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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.