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Finding the Fourth Proportional to 491.10, 677.56 and 316.48

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Solution

The fourth proportional to 491.10, 677.56 and 316.48 is: 436.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.10 : 677.56 = 316.48 : x
  2. Step 2: Convert to fraction form
    491.10/677.56 = 316.48/x
  3. Step 3: Cross multiply
    491.10x = 677.56 × 316.48
  4. Step 4: Simplify right side
    491.10x = 214,434.19
  5. Step 5: Solve for x
    x = 214,434.19/491.10
  6. Step 6: Final answer
    x = 436.64

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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.