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Finding the Fourth Proportional to 931.44, 1,285.36 and 558.64

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Solution

The fourth proportional to 931.44, 1,285.36 and 558.64 is: 770.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.44 : 1,285.36 = 558.64 : x
  2. Step 2: Convert to fraction form
    931.44/1,285.36 = 558.64/x
  3. Step 3: Cross multiply
    931.44x = 1,285.36 × 558.64
  4. Step 4: Simplify right side
    931.44x = 718,053.51
  5. Step 5: Solve for x
    x = 718,053.51/931.44
  6. Step 6: Final answer
    x = 770.91

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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.