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Finding the Fourth Proportional to 715.32, 1,072.80 and 344.76

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Solution

The fourth proportional to 715.32, 1,072.80 and 344.76 is: 517.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.32 : 1,072.80 = 344.76 : x
  2. Step 2: Convert to fraction form
    715.32/1,072.80 = 344.76/x
  3. Step 3: Cross multiply
    715.32x = 1,072.80 × 344.76
  4. Step 4: Simplify right side
    715.32x = 369,858.53
  5. Step 5: Solve for x
    x = 369,858.53/715.32
  6. Step 6: Final answer
    x = 517.05

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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.