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Finding the Fourth Proportional to 712.95, 1,068.89 and 279.87

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Solution

The fourth proportional to 712.95, 1,068.89 and 279.87 is: 419.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.95 : 1,068.89 = 279.87 : x
  2. Step 2: Convert to fraction form
    712.95/1,068.89 = 279.87/x
  3. Step 3: Cross multiply
    712.95x = 1,068.89 × 279.87
  4. Step 4: Simplify right side
    712.95x = 299,148.84
  5. Step 5: Solve for x
    x = 299,148.84/712.95
  6. Step 6: Final answer
    x = 419.59

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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.