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Finding the Fourth Proportional to 931.18, 1,284.98 and 558.36

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Solution

The fourth proportional to 931.18, 1,284.98 and 558.36 is: 770.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.18 : 1,284.98 = 558.36 : x
  2. Step 2: Convert to fraction form
    931.18/1,284.98 = 558.36/x
  3. Step 3: Cross multiply
    931.18x = 1,284.98 × 558.36
  4. Step 4: Simplify right side
    931.18x = 717,481.43
  5. Step 5: Solve for x
    x = 717,481.43/931.18
  6. Step 6: Final answer
    x = 770.51

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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.