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Finding the Fourth Proportional to 693.80, 1,040.71 and 260.65

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Solution

The fourth proportional to 693.80, 1,040.71 and 260.65 is: 390.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.80 : 1,040.71 = 260.65 : x
  2. Step 2: Convert to fraction form
    693.80/1,040.71 = 260.65/x
  3. Step 3: Cross multiply
    693.80x = 1,040.71 × 260.65
  4. Step 4: Simplify right side
    693.80x = 271,259.76
  5. Step 5: Solve for x
    x = 271,259.76/693.80
  6. Step 6: Final answer
    x = 390.98

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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.