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Finding the Fourth Proportional to 1,105.65, 1,657.40 and 520.97

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Solution

The fourth proportional to 1,105.65, 1,657.40 and 520.97 is: 780.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.65 : 1,657.40 = 520.97 : x
  2. Step 2: Convert to fraction form
    1,105.65/1,657.40 = 520.97/x
  3. Step 3: Cross multiply
    1,105.65x = 1,657.40 × 520.97
  4. Step 4: Simplify right side
    1,105.65x = 863,444.79
  5. Step 5: Solve for x
    x = 863,444.79/1,105.65
  6. Step 6: Final answer
    x = 780.94

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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.