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Finding the Fourth Proportional to 949.65, 1,309.55 and 634.91

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Solution

The fourth proportional to 949.65, 1,309.55 and 634.91 is: 875.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.65 : 1,309.55 = 634.91 : x
  2. Step 2: Convert to fraction form
    949.65/1,309.55 = 634.91/x
  3. Step 3: Cross multiply
    949.65x = 1,309.55 × 634.91
  4. Step 4: Simplify right side
    949.65x = 831,439.84
  5. Step 5: Solve for x
    x = 831,439.84/949.65
  6. Step 6: Final answer
    x = 875.53

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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.