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Finding the Fourth Proportional to 934.13, 1,287.90 and 638.89

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Solution

The fourth proportional to 934.13, 1,287.90 and 638.89 is: 880.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.13 : 1,287.90 = 638.89 : x
  2. Step 2: Convert to fraction form
    934.13/1,287.90 = 638.89/x
  3. Step 3: Cross multiply
    934.13x = 1,287.90 × 638.89
  4. Step 4: Simplify right side
    934.13x = 822,823.21
  5. Step 5: Solve for x
    x = 822,823.21/934.13
  6. Step 6: Final answer
    x = 880.84

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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.