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Finding the Fourth Proportional to 934.38, 1,289.76 and 639.12

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Solution

The fourth proportional to 934.38, 1,289.76 and 639.12 is: 882.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.38 : 1,289.76 = 639.12 : x
  2. Step 2: Convert to fraction form
    934.38/1,289.76 = 639.12/x
  3. Step 3: Cross multiply
    934.38x = 1,289.76 × 639.12
  4. Step 4: Simplify right side
    934.38x = 824,311.41
  5. Step 5: Solve for x
    x = 824,311.41/934.38
  6. Step 6: Final answer
    x = 882.20

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1.5x scale

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.