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Finding the Fourth Proportional to 953.76, 1,315.26 and 638.94

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Solution

The fourth proportional to 953.76, 1,315.26 and 638.94 is: 881.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.76 : 1,315.26 = 638.94 : x
  2. Step 2: Convert to fraction form
    953.76/1,315.26 = 638.94/x
  3. Step 3: Cross multiply
    953.76x = 1,315.26 × 638.94
  4. Step 4: Simplify right side
    953.76x = 840,372.22
  5. Step 5: Solve for x
    x = 840,372.22/953.76
  6. Step 6: Final answer
    x = 881.11

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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.