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Finding the Fourth Proportional to 838.55, 1,157.28 and 465.65

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Solution

The fourth proportional to 838.55, 1,157.28 and 465.65 is: 642.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.55 : 1,157.28 = 465.65 : x
  2. Step 2: Convert to fraction form
    838.55/1,157.28 = 465.65/x
  3. Step 3: Cross multiply
    838.55x = 1,157.28 × 465.65
  4. Step 4: Simplify right side
    838.55x = 538,887.43
  5. Step 5: Solve for x
    x = 538,887.43/838.55
  6. Step 6: Final answer
    x = 642.64

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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.