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Finding the Fourth Proportional to 491.36, 677.85 and 316.76

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Solution

The fourth proportional to 491.36, 677.85 and 316.76 is: 436.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.36 : 677.85 = 316.76 : x
  2. Step 2: Convert to fraction form
    491.36/677.85 = 316.76/x
  3. Step 3: Cross multiply
    491.36x = 677.85 × 316.76
  4. Step 4: Simplify right side
    491.36x = 214,715.77
  5. Step 5: Solve for x
    x = 214,715.77/491.36
  6. Step 6: Final answer
    x = 436.98

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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.