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Finding the Fourth Proportional to 693.17, 1,039.80 and 260.31

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Solution

The fourth proportional to 693.17, 1,039.80 and 260.31 is: 390.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.17 : 1,039.80 = 260.31 : x
  2. Step 2: Convert to fraction form
    693.17/1,039.80 = 260.31/x
  3. Step 3: Cross multiply
    693.17x = 1,039.80 × 260.31
  4. Step 4: Simplify right side
    693.17x = 270,670.34
  5. Step 5: Solve for x
    x = 270,670.34/693.17
  6. Step 6: Final answer
    x = 390.48

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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.