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Finding the Fourth Proportional to 491.10, 677.55 and 281.28

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Solution

The fourth proportional to 491.10, 677.55 and 281.28 is: 388.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.10 : 677.55 = 281.28 : x
  2. Step 2: Convert to fraction form
    491.10/677.55 = 281.28/x
  3. Step 3: Cross multiply
    491.10x = 677.55 × 281.28
  4. Step 4: Simplify right side
    491.10x = 190,581.26
  5. Step 5: Solve for x
    x = 190,581.26/491.10
  6. Step 6: Final answer
    x = 388.07

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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.