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Finding the Fourth Proportional to 505.70, 697.80 and 316.76

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Solution

The fourth proportional to 505.70, 697.80 and 316.76 is: 437.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.70 : 697.80 = 316.76 : x
  2. Step 2: Convert to fraction form
    505.70/697.80 = 316.76/x
  3. Step 3: Cross multiply
    505.70x = 697.80 × 316.76
  4. Step 4: Simplify right side
    505.70x = 221,035.13
  5. Step 5: Solve for x
    x = 221,035.13/505.70
  6. Step 6: Final answer
    x = 437.09

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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.