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Finding the Fourth Proportional to 1,120.25, 1,545.73 and 641.64

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Solution

The fourth proportional to 1,120.25, 1,545.73 and 641.64 is: 885.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.25 : 1,545.73 = 641.64 : x
  2. Step 2: Convert to fraction form
    1,120.25/1,545.73 = 641.64/x
  3. Step 3: Cross multiply
    1,120.25x = 1,545.73 × 641.64
  4. Step 4: Simplify right side
    1,120.25x = 991,802.20
  5. Step 5: Solve for x
    x = 991,802.20/1,120.25
  6. Step 6: Final answer
    x = 885.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.