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Finding the Fourth Proportional to 949.92, 1,311.60 and 688.32

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Solution

The fourth proportional to 949.92, 1,311.60 and 688.32 is: 950.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.92 : 1,311.60 = 688.32 : x
  2. Step 2: Convert to fraction form
    949.92/1,311.60 = 688.32/x
  3. Step 3: Cross multiply
    949.92x = 1,311.60 × 688.32
  4. Step 4: Simplify right side
    949.92x = 902,800.51
  5. Step 5: Solve for x
    x = 902,800.51/949.92
  6. Step 6: Final answer
    x = 950.40

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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.