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Finding the Fourth Proportional to 718.10, 991 and 508.65

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Solution

The fourth proportional to 718.10, 991 and 508.65 is: 701.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.10 : 991 = 508.65 : x
  2. Step 2: Convert to fraction form
    718.10/991 = 508.65/x
  3. Step 3: Cross multiply
    718.10x = 991 × 508.65
  4. Step 4: Simplify right side
    718.10x = 504,072.15
  5. Step 5: Solve for x
    x = 504,072.15/718.10
  6. Step 6: Final answer
    x = 701.95

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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.