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Finding the Fourth Proportional to 949.12, 1,309.92 and 634.28

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Solution

The fourth proportional to 949.12, 1,309.92 and 634.28 is: 875.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.12 : 1,309.92 = 634.28 : x
  2. Step 2: Convert to fraction form
    949.12/1,309.92 = 634.28/x
  3. Step 3: Cross multiply
    949.12x = 1,309.92 × 634.28
  4. Step 4: Simplify right side
    949.12x = 830,856.06
  5. Step 5: Solve for x
    x = 830,856.06/949.12
  6. Step 6: Final answer
    x = 875.40

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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.