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Finding the Fourth Proportional to 954.06, 1,316.43 and 639.78

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Solution

The fourth proportional to 954.06, 1,316.43 and 639.78 is: 882.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.06 : 1,316.43 = 639.78 : x
  2. Step 2: Convert to fraction form
    954.06/1,316.43 = 639.78/x
  3. Step 3: Cross multiply
    954.06x = 1,316.43 × 639.78
  4. Step 4: Simplify right side
    954.06x = 842,225.59
  5. Step 5: Solve for x
    x = 842,225.59/954.06
  6. Step 6: Final answer
    x = 882.78

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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.