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Finding the Fourth Proportional to 954.13, 1,321.81 and 931.45

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Solution

The fourth proportional to 954.13, 1,321.81 and 931.45 is: 1,290.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.13 : 1,321.81 = 931.45 : x
  2. Step 2: Convert to fraction form
    954.13/1,321.81 = 931.45/x
  3. Step 3: Cross multiply
    954.13x = 1,321.81 × 931.45
  4. Step 4: Simplify right side
    954.13x = 1,231,199.92
  5. Step 5: Solve for x
    x = 1,231,199.92/954.13
  6. Step 6: Final answer
    x = 1,290.39

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.