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Finding the Fourth Proportional to 928.64, 1,281.15 and 633.40

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Solution

The fourth proportional to 928.64, 1,281.15 and 633.40 is: 873.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.64 : 1,281.15 = 633.40 : x
  2. Step 2: Convert to fraction form
    928.64/1,281.15 = 633.40/x
  3. Step 3: Cross multiply
    928.64x = 1,281.15 × 633.40
  4. Step 4: Simplify right side
    928.64x = 811,477.21
  5. Step 5: Solve for x
    x = 811,477.21/928.64
  6. Step 6: Final answer
    x = 873.83

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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.