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Finding the Fourth Proportional to 693.60, 1,040.45 and 260.75

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Solution

The fourth proportional to 693.60, 1,040.45 and 260.75 is: 391.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.60 : 1,040.45 = 260.75 : x
  2. Step 2: Convert to fraction form
    693.60/1,040.45 = 260.75/x
  3. Step 3: Cross multiply
    693.60x = 1,040.45 × 260.75
  4. Step 4: Simplify right side
    693.60x = 271,297.34
  5. Step 5: Solve for x
    x = 271,297.34/693.60
  6. Step 6: Final answer
    x = 391.14

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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.