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Finding the Fourth Proportional to 715.31, 1,072.54 and 345.02

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Solution

The fourth proportional to 715.31, 1,072.54 and 345.02 is: 517.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.31 : 1,072.54 = 345.02 : x
  2. Step 2: Convert to fraction form
    715.31/1,072.54 = 345.02/x
  3. Step 3: Cross multiply
    715.31x = 1,072.54 × 345.02
  4. Step 4: Simplify right side
    715.31x = 370,047.75
  5. Step 5: Solve for x
    x = 370,047.75/715.31
  6. Step 6: Final answer
    x = 517.33

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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.