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Finding the Fourth Proportional to 1,698.09, 2,545.17 and 657.60

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Solution

The fourth proportional to 1,698.09, 2,545.17 and 657.60 is: 985.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,698.09 : 2,545.17 = 657.60 : x
  2. Step 2: Convert to fraction form
    1,698.09/2,545.17 = 657.60/x
  3. Step 3: Cross multiply
    1,698.09x = 2,545.17 × 657.60
  4. Step 4: Simplify right side
    1,698.09x = 1,673,703.79
  5. Step 5: Solve for x
    x = 1,673,703.79/1,698.09
  6. Step 6: Final answer
    x = 985.64

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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.