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Finding the Fourth Proportional to 1,077.54, 1,618.74 and 931.74

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Solution

The fourth proportional to 1,077.54, 1,618.74 and 931.74 is: 1,399.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.54 : 1,618.74 = 931.74 : x
  2. Step 2: Convert to fraction form
    1,077.54/1,618.74 = 931.74/x
  3. Step 3: Cross multiply
    1,077.54x = 1,618.74 × 931.74
  4. Step 4: Simplify right side
    1,077.54x = 1,508,244.81
  5. Step 5: Solve for x
    x = 1,508,244.81/1,077.54
  6. Step 6: Final answer
    x = 1,399.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.