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Finding the Fourth Proportional to 953.76, 1,316.50 and 639.66

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Solution

The fourth proportional to 953.76, 1,316.50 and 639.66 is: 882.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.76 : 1,316.50 = 639.66 : x
  2. Step 2: Convert to fraction form
    953.76/1,316.50 = 639.66/x
  3. Step 3: Cross multiply
    953.76x = 1,316.50 × 639.66
  4. Step 4: Simplify right side
    953.76x = 842,112.39
  5. Step 5: Solve for x
    x = 842,112.39/953.76
  6. Step 6: Final answer
    x = 882.94

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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.