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Finding the Fourth Proportional to 502.79, 693.28 and 316.05

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Solution

The fourth proportional to 502.79, 693.28 and 316.05 is: 435.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.79 : 693.28 = 316.05 : x
  2. Step 2: Convert to fraction form
    502.79/693.28 = 316.05/x
  3. Step 3: Cross multiply
    502.79x = 693.28 × 316.05
  4. Step 4: Simplify right side
    502.79x = 219,108.94
  5. Step 5: Solve for x
    x = 219,108.94/502.79
  6. Step 6: Final answer
    x = 435.79

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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.