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Finding the Fourth Proportional to 715.07, 1,071.51 and 349.40

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Solution

The fourth proportional to 715.07, 1,071.51 and 349.40 is: 523.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.07 : 1,071.51 = 349.40 : x
  2. Step 2: Convert to fraction form
    715.07/1,071.51 = 349.40/x
  3. Step 3: Cross multiply
    715.07x = 1,071.51 × 349.40
  4. Step 4: Simplify right side
    715.07x = 374,385.59
  5. Step 5: Solve for x
    x = 374,385.59/715.07
  6. Step 6: Final answer
    x = 523.56

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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.