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Finding the Fourth Proportional to 953.76, 1,315.71 and 639.09

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Solution

The fourth proportional to 953.76, 1,315.71 and 639.09 is: 881.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.76 : 1,315.71 = 639.09 : x
  2. Step 2: Convert to fraction form
    953.76/1,315.71 = 639.09/x
  3. Step 3: Cross multiply
    953.76x = 1,315.71 × 639.09
  4. Step 4: Simplify right side
    953.76x = 840,857.10
  5. Step 5: Solve for x
    x = 840,857.10/953.76
  6. Step 6: Final answer
    x = 881.62

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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.