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Finding the Fourth Proportional to 953.85, 1,315.57 and 639.01

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Solution

The fourth proportional to 953.85, 1,315.57 and 639.01 is: 881.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.85 : 1,315.57 = 639.01 : x
  2. Step 2: Convert to fraction form
    953.85/1,315.57 = 639.01/x
  3. Step 3: Cross multiply
    953.85x = 1,315.57 × 639.01
  4. Step 4: Simplify right side
    953.85x = 840,662.39
  5. Step 5: Solve for x
    x = 840,662.39/953.85
  6. Step 6: Final answer
    x = 881.34

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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.