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Finding the Fourth Proportional to 719.63, 993.89 and 486.35

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Solution

The fourth proportional to 719.63, 993.89 and 486.35 is: 671.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.63 : 993.89 = 486.35 : x
  2. Step 2: Convert to fraction form
    719.63/993.89 = 486.35/x
  3. Step 3: Cross multiply
    719.63x = 993.89 × 486.35
  4. Step 4: Simplify right side
    719.63x = 483,374.65
  5. Step 5: Solve for x
    x = 483,374.65/719.63
  6. Step 6: Final answer
    x = 671.70

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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.