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Finding the Fourth Proportional to 931.25, 1,284.84 and 538.30

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Solution

The fourth proportional to 931.25, 1,284.84 and 538.30 is: 742.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.25 : 1,284.84 = 538.30 : x
  2. Step 2: Convert to fraction form
    931.25/1,284.84 = 538.30/x
  3. Step 3: Cross multiply
    931.25x = 1,284.84 × 538.30
  4. Step 4: Simplify right side
    931.25x = 691,622.24
  5. Step 5: Solve for x
    x = 691,622.24/931.25
  6. Step 6: Final answer
    x = 742.68

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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.