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Finding the Fourth Proportional to 713.19, 1,069.28 and 347.75

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Solution

The fourth proportional to 713.19, 1,069.28 and 347.75 is: 521.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.19 : 1,069.28 = 347.75 : x
  2. Step 2: Convert to fraction form
    713.19/1,069.28 = 347.75/x
  3. Step 3: Cross multiply
    713.19x = 1,069.28 × 347.75
  4. Step 4: Simplify right side
    713.19x = 371,842.12
  5. Step 5: Solve for x
    x = 371,842.12/713.19
  6. Step 6: Final answer
    x = 521.38

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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.