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Finding the Fourth Proportional to 954.63, 1,316.64 and 639.80

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Solution

The fourth proportional to 954.63, 1,316.64 and 639.80 is: 882.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.63 : 1,316.64 = 639.80 : x
  2. Step 2: Convert to fraction form
    954.63/1,316.64 = 639.80/x
  3. Step 3: Cross multiply
    954.63x = 1,316.64 × 639.80
  4. Step 4: Simplify right side
    954.63x = 842,382.09
  5. Step 5: Solve for x
    x = 842,382.09/954.63
  6. Step 6: Final answer
    x = 882.41

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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.